I do something like that with the mental part where something "replays" in my head and I get all the feelings I felt all over again. But it's not just with anxiety, sometimes it'll be the complete opposite where something good happened.
I think it's more of an anxiety thing. I don't know if I have social anxiety or what but when I'm out in public or in a "social" situation, I tend to feel nothing, not really tense up.. I don't know, I can't explain it. It's like that part of my brain doesn't work right. (lol I've read something about that) and then when I get home I replay it. I was reading about anxiety and things and I was wondering if it's because I don't know how to deal or what to do with certain feelings so they turn into "compulsions".