[Ireland]

I had the realization just now that I've been diagnosed with anxiety for 18 years now. D:

For me, a large component of dealing with anxiety when it pops up is changing my environment. I usually need to get up and move away from where I am or what I am doing. It helps derail the thought process that my mind gets stuck in. :/ That and I find a warm drink or one with caffeine helps a great deal.
All of that only helps if I'm not in the middle of a full blown panic attack. If I'm in the middle of one, I usually take a small amount of prescribed Xanax and caffeinate myself.
If you don't have Xanax, there is a over the counter supplement that my therapist recommended a long time ago known as GABA. You can get it at most stores that sell supplements and vitamins.