Hun, as you say, this does usually happen more often with tandem feeding or feeding while pg, but it can occur at other times as well. For some mums it is so uncomfortable that they decide to wean. I hope for you this is just a phase that you can get through and come out the other side.

I'm not sure how much is known about the cause, but a friend of mine has a similar reaction to some medications so I wonder if it has to do with the levels of something?