I'm a 22 years old guy. I'm in a relationship since 2 years, with an active sexual life. 4 days ago, we had sex with my gf. At the end, I tried to hold back the ejaculation, because I wanted her to finish first. It was that the common "pushing" feeling. The same kind of feeling when I try to hold my pee. It happened before too, there was nothing unusual. But this time I managed barely to withhold my ejaculation, because I start a bit late. However, I was on the "edge" to come for about half a minute, and I felt that "pushing" feeling. The unusual thing is what I experienced later, was that when my penis in "resting" state, it would get very small, and a bit hard or swelled at the bottom - the base of the penis. It was kind of like when I shaved my groin area, and it contracted because of the cold water. I have no pains when urinating, I can get an erection, and an ejaculation since then. But there is that hard feeling, and smaller size when resting. And also my morning erections aren't the same since then. They are weeker, and the head isn't that big than earlier. Can someone help? I am very nervous and worried about that.