Feeling very nervous about this stumble in our sex life.?

[Big Dog]

I've been married for almost 2 years. Our sex life has been great up until we started ttc. I remember the first time I was unable to ejaculate, my wife took it very painfully, saying "she wasn't expecting sexual problems so early in our marriage"... that following week, I was totally unable to perform and was very sad, thinking I wouldn't be able to father a child and make my wife happy. Fortunately, things went back to normal almost immediately, my wife got pregnant and now we have a beautiful 5 months old baby. As my wife had a tear and stitches, we didn't have sex for two months after a childbirth. We were both eager to get back on track, and even it was painful for her, my wife was desperate to have sex, which I didn't particularly enjoy as it seemed more like a duty, not a pleasure. And here we come again, I was unable to ejaculate again, and again, and again...getting very anxious when it comes to intercourse. I don't feel as pressured as during time when we were trying to conceive, but still feel very sad when it happens. Does it sound like a performance anxiety? and how to overcome it?