The back ache is a nightmare honey it does ease off,try a pillow under your bum and one under your knees this may help,the Macoms are supposed to stretch in the cup I think to support your breasts but Im not sure how tight they should be,give the nurse a ring and see what she suggests honey,they wont mind,in a few weeks you will be in proper bras and you will be so surprised how big you look and measure,xxx