I believe my experience is similar. It’s like you have a switch connected to your mood. It’s on for a while and you feel social, then it turns off and you’re not. There’s not much of a middle ground. For myself, I think there always was an underlying feeling that something is missing during a social period. Like I didn’t or couldn’t quite connect with those people. Or they didn’t respond to me in the way that I think they should have. Then the anti-social feelings kick in after a period of time.