That does'nt seem at all normal to me. All those Dr.s and not one of them mentioned a Biopsy. Maybe a breast surgeon would now more. Let me know what happens.
Tender and sore, but not to the degree you mentioned were indications for me of fibrocystic disease. I had it for many many years before my babies were born. I still have very dense breasts (my mammos are white, well, the remaining breast is). You should see if you can follow up with the breast surgeon just to be sure, but it does sound like you have some inflamed cysts. Possibly there is something else going on. Be pushy and get in with a surgeon just to be sure.
Hope the pain eases up and there is nothing serious, just annoying, going on.
Lisa