Well- I don't know how much "advice" I can give you.... I actually had
breast enhancement surgery last year. I don't regret it - not one bit - but I know/understand that reduction is way different. My sis-in-law had it done (she was 26) - she was a DD and went down to a B-cup. I don't know if it was her doctor, or the way her breasts were or what.... but he basically butchered her. She had a huge horrible scar that looked like a big X across her chest. She was pleased with the "lack of weight" & the B-cup, but she hated that scar.
One thing I CAN tell you is that you need to "interview" 2 or 3 doctors before you get into this. From my own experience, I felt like an elephant was sitting on my chest for a few days.... then again, they sure do give ya some super-duper drugs

...I was totally loopy for the first 3 days; couldn't have told ya my name!
But DO think long & hard about this before you do it - talk to doctors, get referrals... good doctors will give you the names/numbers of some patients so you can talk to them, get to know them. Do a MASSIVE GOOGLE search, read, read, read! It's a serious operation, after all, you're REMOVING part of you! I'm not trying to scare you; just want you to be aware. Oh, and your doc is right... wait to see what the weight loss does for you. Boobs get smaller like any other part when you're dieting.
Good luck with your decision.