Well- I have a totally different opinion about what is going on Brodie...
my idea is that the problems coming from your circumcision are more in the normal/common range of circumcision problems which might be mostly relieved with restoration....
I don't know that I am convinced that there is some sort of irreparable nerve damage (above and beyond the "normal" circumcision nerve damage.)
The reason why?
You discribe your symptoms in terms of the frequency of sex.
This makes me think that the painful feelings you are having come from raw abrabed tearing from intercourse because of the very tight skin, and possibly th other de-sensitizing effects of keritinization and the way you (might) be having sex to overcome those other problems.
If you had said, "If I am on my feet all day- my dick goes numb." or "If I'm in the car longer than an hour it starts to throb painfully."or "I can't feel anything when I masturbate or have sex" or "one side is numb" I might think there was a nerve damage, but because your painful feelings have to do with the frequency you have sex, I can't imagine that would have to do with damaged nerves that are present all of the time regardless if you have sex.
Of course I am NOT a DR or in any way qualified to diagnose ... I am just trying to figure it out from what you said.
My short term ideas. #1 get and use a lube you both like. That should cut down on some of the abrasion and pulling.
#2 realise that sometimes circumcised men have sex diffently than men who are used to having their glans covred all the time. A circumcised man usually like a lot of pressure which is why the polls all show them liking oral and anal sex more than intact men... it's not that intact men don't like it- it's just that they don't *need* the added stimulation ... this makes some circumcised guys need to thrust very hard to get the stimultion they need- well- a guy might find his pleasure there- but he also might tear himself (and his partner) up in the process too. It's possible that if your glans was not always exposed and you were able to get back some of that sensitivity- then you would be able to change the way you have sex a little without sacrificing any pleasure.
My idea- there is product... (yes- you too can dress like a Red Hot Chilli Pepper!") It's a penis undergarment. Even before you start restoring or on your days in between, or even if you don't restore - by keeping your glans covered you will allow those nerves to "liven up"
This undergarment might also be just the "bandaid" you need if you do wind up feeling raw aftr sex and the touch of th sheets or your underwear is too much- maybe it will work for you.http://www.manhood.mb.ca/details.html
It does sound to me that you would really benefit from restoring a little bit, even if you don't decide to restore all the way- it sounds like you would gt a lot of relief from taking that tension off the scar.
I'm really sory that you have to deal with this, but I hope that soon you will b abl to find a solution.