I think what might be part of your wife's problem is that she see's EVERYTHING as if she is the center. I think to a degree we all do this, but I really think she is far beyond ever, ever really hearing you.
I say this because when you mentioned that your prescription would possibly benefit her, she perked up. That's very, very sad.
Like you've pointed out, though, there are positives to her responses, and I do believe her encouragement for you to seek therapy is good for you. I think she is encouraging you for herself at this moment -- that sad, but it's okay, too...she has no idea what is coming when you start getting healthy again.
I think in the last week you have taken some huge steps for yourself that you should really be proud of. The most important of them being you have been honest with your wife, even if she at this point cannot or will not see your pain (seeing or acknowledging your pain could be very painful for her, you know. That could be one of the reasons she is in such deep denial).
But at least now she is aware. You are changing the dance, slowly but surely, and believe me, she is going to start to notice. I promise.
At this point, try not to put too much stock in her responses to you, because again, I don't think she is responding to you honestly. And because she isn't, all you are doing is opening yourself up for hurt if you take what she says to heart. If she doesn't agree with one thing you are doing, so what. You aren't doing them for her. You are doing these things for yourself.
If it means anything to you, I'm am so excited and so proud of you I've got tears in my eyes. (That sounds rather patronizing, but I sure don't mean it that way). You've got a twinge of hope where before there was less than none.
Get to therapy, guy. Try to read that book I recommended, at least in snatches...you are on your way!!!!!!!!!!!!!!!!