Heavy exercising, especially aerobic exercising. Something light like half an hour walk isn't enough, I have to properly exhaust myself calm the fuck down. Some different workouts that are usually enough are: one hour of heavy barbell training at the gym, 45 minutes of running, two hours of brisk walking.

Also interacting people in a non-bullshit way works but is often more difficult to do. Keeping up appearances and roles works the opposite, but if I tell people what I actually think and let myself be more emotional and less reserved around them, I actually feel more connected, which alleviates anxiety.

I think that at the hear, anxiety is born out of insecurity. Being connected (in a real, non-pretentious/bullshit way) with people raises my security. However, this is often easier said than done. I guess exercising works as a sort of a patch by reducing my energy levels so much that I don't any left for my anxiety.