@yasmineseropian - have you considered an Rx for Propranolol? In reading many of the posts on this forum for Long Term Covid, many folks who talk about the internal trembling and racing heart (that's me) said it really helps. In reading it up online it indicates it's also very helpful with anxiety and 'flight & fight" mode - that's me as well 24/7 and I can't seem to get my mind and body of this state.