From my reading, people with brain damage experience some anxiety when in places that have a lot going on. Did some research and it was referred to as brain flooding. I guess there is a lot for your brain to process (smells, heat, moisture, sights, etc) and rather than get overwhelmed, the normal brain ignores the inconsequential things and focuses on the things that could cause harm. I read that the brains of people with strokes or other brain injuries can’t selectively process like people without brain injuries and flooding happens. This has led to anxiety and getting light headed in my case. It is much better now, I still get it at times.