I'm trying not to make fun ijust n case ur serious, but i'm confused.  Ur afraid u can't satisfy your future wife, (havn't u taken her out for a test drive to see what happens?), so ur looking 4 help finding a dr on a site for guys who can't get enuff???

Assuming you two weren't saving yourself for marriage (in which case, I don't know what the hell you're doing on a board like this), have you considered that your future wife has entered into this engagement with full knowledge of your sex drive levels, and is actually comfortable with it? Many women (not all) have lower sex drives. Don't assume she needs to be needs to be sexed up 24/7 unless you have actually talked with her and she's expressed this sentiment. Second women are just plain old more versatile than men. We don't always need a penis or even actual penetration for satisfaction.  Consider, say, toys, fingers, or even just a really fantastic back/body massage.

In short, if you've assumed a problem before even talking with her, then this really an issue about your mental perceptions of an inadequacy that may or may not even exist in reality (at least in any way that would actually pose a problem for your relationship), and if she has expressed a desire for me, put your penis ego aside and realize you can rock her socks with a great deal more than your cock.

And a note on the drugs in general-consider doing a full round of neurofeedback. It's designed to naturally "teach" your brain to regulate itself into more ideal brainwave states, and many, many people who have undergone it either no longer need drugs, or else need a drastically decreased dose. I can promise you a reduction or elimination in the drugs will increase your quality of life far outside the bedroom.

Assuming this is a serious post, which I doubt, and assuming your fiancee has a brain, I think your risk of not satisfying her is much greater in the intelligence department than anything sexual.