Oompa,
I can't imagine what it's like to be in your situation, although I'm currently active and want to fade. When it comes to persuading someone to reconsider their beliefs, they're going to have to do it by themselves. Trying to argue or plead with her is not helping. It seems like there is little you can do in terms of getting her to change, but there is something you could do to help yourself endure your situation.
Although trying to get the right balance of medication has been a mess, you should ask your therapist how you can cope with your own anxieties. You mentioned many times before that you've been feeling guilty about living a double life and maybe you're feeling bad because you're wife is feeling bad. Since you have this burden, ask her what strategy you can use to cope with all those miserable thoughts and emotions. If medication is a bust (I'm not saying it is- I'm not an expert), then you should try to find some healthy way of coping with these feelings.
She might not come around to understand you, but that doesn't mean you have to let it get the best of you.
By the way, I don't think you should feel guilty for living a double life. I've been living a double life for about seven years, but it's the only way I know how to stay sane. Sometimes you have to make compromises when you're in a tough situation. Give yourself a break, because few people will.
Hope things get better.