How to cope with anxiety when you can't leave?

Go to the bathroom and stay in there for a bit for some peace and quiet. To breathe. To text or call someone. To splash cold water on face. Etc :)

I play music so I can focus on the music and I go shopping online and then pick it from the store so I don’t have to have the whole shopping thing.

it helps for me to be out with someone that i know, to rarely go out alone. having that support by my side is very good for me. but sometimes i have to go out alone to run errands or something, and in those moments, i try to avoid speaking to people, fidget a lot for comfort, and just get what i need without delay. i think having candy with you to keep you grounded is a really good idea and i might try that myself!