cognitive therapy, meditation, excercise such as walking.
Positive thinking, intellectualization or being able to research
the type of anxiety you have and understand it, which is a very
proactive approach to dealing with it.
being constructive, and talking to others about it.
the list may be even longer than that. but I suffer from
generalized anxiety disorder and those are some of the coping
skills I use.
also, if you don't know what kind of anxiety disorder you have,
it is crucial to be assesed by a professional.
self-assesments done online might help to.
but I would definitely try to find a psychologist or
psychiatrist who would know a little more about the symptoms,
causes and treatments.