I'm so sorry to hear that you've had such trouble breastfeeding. I had a lot of pain with BFing for the first three months - the only way I could continue was to use a nipple shield, which is typically not recommended since it can reduce the amount of milk the baby can get and can therefore lower your supply, but it was the only way I could keep going.
I went to a bunch of lactation consultants and to a doctor who specializes in BFing, and none of them figured out the problem - it was the women on the boards here who finally helped me to solve the issue (you can see my original post here). For me, the main problem was that my daughter had an undiagnosed posterior tongue tie, and we were able to go to a pediatric dentist to get it corrected when she was three months old. I figured that out by posting my own post here under the BF difficulties forum, and describing in detail all of the issues and what we had already tried. Maybe if you did that also, you might get some helpful advice from women here who have had similar problems?
Here is what I can share from my experience:
I, too, had vasospasms. In my case, they were the result of the trauma to the nipple caused by my daughters incorrect latch. The main advise for the vasospasms themselves that worked for me was to keep the nipples warm all the time. I had been trying to air them out, since that is the advice given when there is the possibility of infection or yeast, etc, but for me that was the worst possible thing. I had Bamboobies nursing pads, which are a pretty thick natural organic washable nursing pad, and I just had those in my bra at all times (even in hot weather), and I always slept with a shirt that covered my nipples well enough to keep them warm (with buttons, for easy nursing access), and I always put my breast immediately back in the bra the second she was done with it (even if that meant hauling it back out again in a few minutes when she wanted to go back and forth). The BF doctor also recommending trying those handwarmers (either disposable, or the kind that you can reuse) in the bra behind the breast pad (although I assume you'd need to be careful that they don't get too hot - ouch!), although I never tried this myself. When the nipple was having a spasm that I wanted to stop right away, I found that squeezing it (which seems counter-intuitive, when it hurts), to force the blood flow back into it, helped to stop the spasm in that moment. I did try a few different medications that were supposed to help, but it didn't really help that much, and the medication gave me headaches, so I stopped trying. I think she also recommended at least 50mg of each of the B vitamins, but I was already taking them and so this wasn't relevant for me.
For me, there were fundamentally two relevant things it would have been good to know about the vasospasms: in my case, they weren't going to improve until I fixed the underlying cause, which was the trauma caused by the incorrect latch caused by (in my case) an untreated posterior tongue tie. I don't know if you have some other underlying cause that could be corrected or not, but if you can get some suggestions from other mamas about what possible causes could be, that might be worth investigating. Secondly, in my case, the spasms never completely went away, but they are completely manageable now and I don't even think about them, and I am still BFing my 18m old daughter at least 3-4 times per day. I think in my case, the tongue tie correction fixed some of her latching issues, but not all (maybe she has a high palate or some other structural issue that makes her latch more problematic?), and so I still use the thick nursing pads and make sure that my nipples are always warm. As long as I avoid marathon nursing sessions, or awkward nursing positions that make her more likely to latch poorly, and I keep my nipples warm, I usually don't really have any noticeable pain. It is sometimes a little bit uncomfortable, especially during my luteal phase (between ovulation and my period), but its almost never enough of an issue that I actually think about it.
In terms of the blocked ducts, I had that several times, too. Here's what the BF doctor recommended for me: I was to take ibuprofen (for anti-inflammatory properties), and then about a half an hour later (when the Advil has had time to kick in) I should get into a hot shower, focusing the heat onto the breast with the blocked duct, and massage it, I think going from the outside of the breast toward the nipple. After doing that I was to immediately BF or pump, and then immediately apply cold to the breast (I tried to avoid cold on the nipple directly b/c of vasospasm issues). Usually doing this once was enough to clear things for me, but I think once or twice I had to repeat it. I kept taking the ibuprofen for about a day to keep the inflammation down while it healed, to help prevent it from immediately coming back. The doctor said not to take the ibuprofen for more than 24 hours, since it could mask a fever from mastitis, which can develop in a blocked duct if is isn't cleared quickly.
I think I tried acupuncture for my pain also, and while I've had success with it for other things, it didn't help me with this issue, probably because I needed to fix the nipple trauma first. I have, however, had acupuncture treatments for other things, and have sometimes had the kind of reaction that you describe afterwards. I think the main thing I was told was to rest and drink a lot of water immediately afterward, and that the symptoms should subside by the next day or so. I didn't typically have this reaction, but it did happen sometimes. I think some people believe that it is a sign that the acupuncture released some areas that were real problems, but you probably need to decide for yourself if this feels like a temporary worsening of symptoms resulting from a release of some underlying problems, or if it just feels like it is making you worse. I've dealt with several difficult health issues in the past (all of which eventually got resolved, thankfully), and I found that for me, sometimes a short-term worsening of symptoms was a good sign, and sometimes a worsening of symptoms meant that I was doing something that was just making myself worse. This is a tricky judgement call, but I would definitely say to trust your own instincts.
I totally know what you mean when comparing the BF pain to childbirth - I had an unmedicated birth center birth, and while I found childbirth pain to be very unpleasant (and definitely thought at the time that it was bad enough I wasn't sure I ever wanted to have a baby again, even though we plan to have another child), I found BF pain to be much worse. I said something like that to another nursing mom at one of the BF clinics I went to, and she looked at me like I was from Mars. A bunch of people, including other moms and doctors, dismissed my pain as a normal part of the beginning of BFing, but I don't think they really appreciated the severity of it. I definitely think that if there is something really wrong, the pain of BFing can be really excruciating, and that other people often don't really realize this if they haven't been through it.
I really hope you find a solution to your BF pain, and as soon as possible! Your particular issue is probably unlikely to be the same as what I had, but I hope that some of my experiences are relevant and helpful for you. Above all, I would say not to give up, and to keep talking to people on these boards and/or seeing other doctors and LCs until you find someone who may be able to explain and treat what is going on. I really want to wish you the best of luck, and I'd love to hear updates, whether things are improving or not. I'll keep my fingers crossed that you find a solution soon!