I feel very light headed/dizzy sometimes when i'm around people and very uncomfortable, either because i fail to connect adequately or feel rejected by them. I suppose when it happens i just try to struggle through it, and make excuses like i'm tired, if people ask. It used to be much worse though. I'd always be tired and i'd get dizzy in any crowded places like the supermarket. But then i changed my sleeping routines/diet/started going to the gym regularly and then that completely disappeared. Explore all possibilities, it might not be just related to your anxiety...