Crowds
Not claustrophobic, not agoraphobic, not really phased by a busy shop, but scared of places so crowded, that if you dropped something, you couldn't pick it up.
If I'm in a full theatre, I get a bit anxious, but half full, I'm all right.
Can't do big festivals, Christmas shopping in city centres, music gigs, any large, popular venue that might be crowded getting in or out (corridors, exits, bars, toilets etc).
Large crowds where, if someone panics, it could cause a stampede.
The unpredictable way people's tempers fray and moods can flick like a switch cause me to be on edge the whole time
Enochlophobia is a fear of crowds and ochlophobia is a fear of mob-like crowds.