My anxiety flares up when I'm in crowds. This could be by being in town when it's busy, a busy street, when I used to go out clubbing or even a crowded lift. This often means that when I get asked to go out there's days I'll have to cancel because I start to panic. Which is not only frustrating for me, but I often think my friends too, luckily all of whom are supportive.
I could ramble for ages about it and there's probably things I've forgotten to say, but that's my anxiety in a nutshell. Next time I'll talk about ways I overcome it.