Mine used to be noticeably lopsided too (a couple of years ago), but now they're pretty symmetrical (and they're E cup, so it would be noticeable.) It was really annoying while it lasted, but I think it was less noticeable than I thought it was.
Have you had your bra size measured recently? It won't correct the problem entirely, but wearing a bra that's the right size and supportive does wonders for your shape, and you may well find that your boobs don't look so great because you're wearing the wrong size. Most women wear a back size too big and a cup size too small, so go and get yourself measured - you may well come out as a 36D or even E - I went from a 36D to a 34E when I went to Bravissimo, whihc is a good place to go if there's one near you, as they're really good and accurate about sizing, btu also recognise that you can't always trust the label; they show you what a well-fitting bra should look like so you're not driven my the sizes which aren't always the same.