Feeltrapped, Dysphoria can be relieved by doing anything towards satisfying your gender incongruence. This can be crossdressing (bad term), transitioning, or merely imagining yourself as your true gender. I think what you are experiencing is the classic build up of dysphoria, then your decision to come out satisfies it some, and it decreases. If the severity is increasing and the duration between attacks is reducing, you need to do something positive about it.
Please discuss this with your wife before you do anything, and don't tell her, I want to be a woman" as this is a sure way to lose her. Talk to her when your dysphoria is low, and explain to her that you are experiencing periods of stress, and you believe this might be gender dysphoria. Ask her to help you find an experienced gender therapist, then both of you talk to the therapist, and be partners in all the decisions from there. If she is part of the decision to transition, she will be far more able to accept it.
If you need to buy time, you can do lots of things to temporarily reduce dysphoria, as mentioned before, to give your wife time to adjust and accept. Don't assume she can take all this in in just a couple of days. I wish you luck in finding your path.
Hugs,
Allie