I can relate, but I realized I like some place more than others. And when I talked to other people, we came to the conclusion that some places cause anxiety even in normal people. There is this one TESCO in Prague, it's underground, very crowded all the time and very loud. Several times I ended up rushing out of the store without buying things I needed... several people I talked to said they dislike it as well.

I am not saying to avoid crowded places altogether, but don't really push yourself too hard. If there are more options to shop for groceries for example, chose the one that suits you most.

What helps me actually is to walk around with my headphones on with my psytrance music on (sometimes different type, but I find trance the most calming). It blocks out some of the noise...