Originally Posted by greendots
On one hand, as others have suggested you may be an introvert, who needs to recharge (alone) before socialising again. On the other hand: May I ask, do you feel you're living a fulfilling life? Socialising can be a nice distraction, but when being alone reality can hit you like a brick.
I related to this aspect. I agree it could be that you are an introvert personality. I know that I am, but most people assume I'm extovert. The difference is how the interactions affect you. If you get energized by others, your extroverted. If you feel drained, you're introverted. I'm an outgoing introvert. But I have found recently, I'm not getting enough social interactions. So when I leave a social situation, I'm feeling sad not as much drained.

How can you get more interactions? Maybe that will help.