Sensory overload! Unless I am with a 'safe' (read: someone I am clingy to - I call them my clingy person) person, I can only do other people in small doses, even the ones I really like. Right now my safe people consists of three lovely persons:
My husband
My sister
My Mom

I have had a really hard time trying to explain my feelings to the people I care about... especially family. Going about life and work and navigating a semblance of a social life (HA!) is hard enough, 'me time' is super super important for us.

Were you at your own home when you had to take off? Sometimes having my sanctuary invaded freaks me out a little until I calm down and feel like the other person is meshing with my home.