My mom went through that. She was always small built but amply endowed (DD cup.) When she kept growing and Growing and GROWING she started getting incredible backaches from the weight. She probably only gained a couple of cup sizes before stopping, but on her little 5'2" frame it looked like she was trying to rival Dolly!
Wish I knew something to help, but she opted for reduction surgery. Just curious, are you on HRT? (Mom was.)