I am so sorry you are feeling so ill. I had these issues, plus pains in the arms, numbness in fingers and went to a neurologist and he had no clue what was happening to me. This was about 2 months before I got iller due to very low sodium. Pllus low cortisol. I surely believe this is all related to your severe stage of AF.
Have you had a hair analysis done? I don't remember if you did.