@chinchuck- I'm at loss for words right now. Have you been checked for arrhythmia? It can cause palpitations and is simple to treat. Palpitations are usually caused by anxiety, if you don't have arrhythmia. It is harmless. https://www.uptodate.com/contents/overview-of-palpitations-in-adults. I understand your fear. I think that you might need a behavioral therapist. I'm inviting @parus to talk about this. It sounds as if you really have yourself in a constant cyclic state of panic. Has you regular doctor dome any blood work recently to make sure that it is only drug withdrawal?