Seriously?
In one short week, you're beginning to doubt your wife just because you're having a little difficulty? Snap out of it. Your physical symptoms are already waning; all you're doing right now is tearing yourself and your marriage up with your own insecurity. Don't allow it to continue. Don't let your mental hang-ups poison your relationship. It's not fair to either you or your wife.
I've experienced an extended period where being around my SO produced no feelings of sexual desire. I've experienced an extended period of time where even when I felt desire, I was unable to climax. It lasted for months. He had the misfortune of meeting me when I was suffering from PTSD, and I simply wasn't in a good mental place to relax and enjoy the moment. I was scared and nervous and anxious--I was afraid I'd blow it, and I was worried that if I couldn't respond normally, this wonderful person would find someone else who would.
Sound familiar?
What helped me get over it was trusting his judgment. The people who love us do so for any number of reasons---some of which we may not even see when we're too busy being down on ourselves. They love us, and that gift of love and faith is too precious to treat with suspicion. They love us--and sometimes, the best thing to do is take the focus off ourselves, and show them that we love them, too. Court your wife, woo your wife, stop thinking about yourself and focus on her. If you're able to stop dwelling on what's happening with you, and just enjoy being with the person you love, you might find the issues you're experiencing resolve themselves.
Right now, you're dealing with performance anxiety; so take FCL's advice and remove the pressure to perform. Explore intimacy all you want, romance your wife, cuddle, kiss, ect...and use this as an opportunity to explore and enjoy all the things you love about each other beyond penetrative sex.
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