My Ts usually tell me to start drawing (I am by no means an artist) sometimes using my non-dominant hand, sometimes finger painting. It does help. I may not figure out why I have that feeling, but I can get the emotions out.

What you describe reminds me of how I feel when I have panic attacks. I don't know why I have these feelings, I know there is something there, but I don't know what. My mind is usually racing without any perception of what thoughts I am having and I find myself very restless. Does that sound familiar?