[Nsfw] Just had a hook-up with a much older man, feel a little strange now.

I have anxiety really bad. So meeting guys online and then in public is impossible. But today at the gym I was showering and I was checking out an older guys butt and he caught me. "Do you like what you see? He asked, while looking at my junk. Long story short he and I did some...uh...oral maneuvers.... And then some other(non-anal) things and I realized that I'm a top. He told me he was married when it was over but then gave me his number. I felt really great for like an hour but now for some reason I'm having a panic attack :/