When I started to do a LOT of thinking instead of reacting to the anxiety I saw that it was usually triggered when something in my thinking was faulty or false (which is how I wound up on SI).
Telling myself lies, being untrue to my true nature, holding things back, etc. = anxiety increased. Let it out, be brutally honest with myself = anxiety decreased.
I think maybe if you are in a situation (training/work) where you can't honor how you are feeling and have to put on a false front it could be creating some anxiety for you.
Hugs and I hope you get it sorted out soon because anxiety is NO fun.