This doesn't surprise me. There are lots of cases where, if you constrain movement of some part of the body, and then remove the constraint and move that part, you get pain. If I fall asleep on the davenport, I get a pain in the leg when I get up.
When my wife stopped wearing a bra, about 10 months ago, she had pain for several weeks. Since we had read about the problems with bras first, we checked a diagram of the lymph system and found out that the pain was in the lymph nodes. She had frequently been wearing a bra to bed (which was what sent me to your site in the first place; I was trying to figure out how to get her to stop that) and so lots of toxins in her breasts were to be expected. It took a long time to get the system cleaned out and pain free, but it is a lot better now then when she was wearing the bras.
In other words, the worse the woman is about wearing a bra too much, the more likely she is to have pain when she takes it off, at least from what I can tell from what I have read. Can anyone tell about their experience with this? First hand reports on this kind of thing should be helpful to others.