Hi, I passed carefully through your question and would explain that your high heart rate could be related to a metabolic disorder (chronic anemia, thyroid gland dysfunction, electrolyte imbalance, etc.). For this reason, I would recommend performing some tests to investigate for the possible causes: -a resting ECG - complete blood count for anemia - thyroid hormone levels for thyroid gland dysfunction - blood electrolytes for possible imbalance. If all the above tests result normal, I would recommend adding a betablocker (Metoprolol, Carvedilol) to your current therapy. Hope I have answered your query. Let me know if I can assist you further.