It can be caused by anxious depression (like there is really any other type) or mania.

I guess you talk about mania.

Maybe listen to some classical music (adagios) and/or go into nature. You are right to feel anxiety. It's a reflection of a strong intuition. Try to focus on just feeling, not thinking. Thoughts hurt, emotions just are. You should simulate or reach some (mild) derealisation.

Mania is not the problem. You aren't the problem. You are right. But forget about all that is in conflict with that. Conflict leads to mania. Mania can lead to rising anxiety or can free you from anxiety. It takes some skill, but focus on practicing that. Observe. Don't think about anything you don't directly sense, see, hear, feel. Don't reason: no derivatives, just primary thoughts and feelings.