For the past 2 or 3 months, I have had very strong, pulsing heart beats and trembly feeling inside my chest that will not go away. Also, I have severe hypertensive periods, vertigo, and tinnitus. I have a history of Hashimoto s but TSH is normal, now. I have had brain MRI, Ct scans, EKGs, carotid dopppler, blood chemistries and all appear to be within normal range, with the exception of Vit D, I have added 5,000IU/day. However, about 2 weeks ago, I had an episode of hypocalcemia, confirmed by Trousseau s sign, periorbital parysthesia, etc.. (but total serum calcium was normal). I have since added calcium supplements. I am currently on 60 mg Cardizem 3x/day but BP is still 150/90. (I had an allergic reaction to carvedilol - hives, swelling.) Have been to ER 3x recently with hypertensive episodes 200/115 and palpitations. Have been to a cardiologist, endocrinologist, and PCP. Should I go to a neurologist? What other things can cause these conditions?