Glad to hear it went well

Re: a plugged duct. It's good to get it checked out like you said. If it is a plugged duct...I've had a couple where I COULD NOT get it unplugged no matter what I tried. I tried all the usual which usually worked great such as baby's chin to the plugged side, massage the duct, warm wash cloth over it, massage it while nursing etc. You know what worked? (You wouldn't want to do this right now w/ a sore breast though). TMI-I squeezed my nipple outward and rolled my nipple between my fingers side to side and squeezed the nipple between my fingers as if I were to get milk flowing. I noticed a white spot when I did this. I kept the nipple pulled and kept rolling and then suddenly "pop"...out shot the milk "cork"...literally! And then the milk sprayed out and I felt immediate relief! It seemed to be literally was stopped up by some old milk that dried up the size of a pin hole sized cork, lol! Not that this is your case but thought I'd mention it.
Re: the duct damage. They will repair themselves, I promise! Mine were damaged (ie-those ducts didn't fill w/ milk) for a little while but they repaired themselves (I don't remember how long it took though, sorry). And during this time, my other ducts just compensated and produced more! It's really amazing what the human body is capable of.
Ouch on the mashing of your poor breast

I agree w/ the pp that if you are in pain, don't be afraid to take bf friendly pain meds. It *could* affect your milk supply if you are in too much pain and don't get a handle on it.
Also want to mention, be watchful of infection. It hurt the next day for sure after the biopsy but then about 3 days afterwards, my breast REALLY REALLY hurt much worse. They didn't warn me of what to look for if I had an infection from the biopsy. I don't think many women get infections from a biopsy but I did (if there's a small chance of something...it always happens to me). I'm sure you'll be fine as the chance is really small but wanted to mention it as well.
Good luck w/ the results. Mine ended up being a lactating adenoma (not harmful). I left it alone for a few years and then I had removed after my dd1 weaned (and before dd2).