I would wait till your finished with having bubbies so they don't continue to stretch and grow and ultimately sag plus the risk of having the nipple moved which might effect bfing. You might be lucky and after bubby is born they might go down, I found after losing a few kgs post pregnancy they did go down from an E during bfing to a DD which is perfect cause you can buy minimizers with underwire YAY!! the best invention ever I know how you feel though it changes your whole shape because your back is trying to support these giant mellons and a belly aswell.
I have been wearing a thick stetchy camisol top over my bra which has really helped keep them snug against my chest, I just bought it from Kmart in the normal underwear section, it doesn't fit over my belly but no one can see it under my clothes. I'm going to get a few more for when baby is born so I can wear them at night just to keep them in control.
:hugs: I feel your pain hun