I have a very hard time it large crowds where I don't feel I have my bubble of space around me. Especially if it line of people all jammed together and walking. The only way I have figured to deal with it is as soon as I find an opening to get out of the line I do.

Today we went to the christening of a navy ship there were about 20,000 people there..when were were jammed in a line (short period of time) I just moved to the side when I couldn't handle it anymore. When were seated for the ceremony I was fine