Boy can I relate. I have been going through the same thing, waking up every 1.5-2 hours with pounding heart, terrible sleep deprivation.
It is so hard to get treatment from the MD because they don't know what to do. I feel like I am going crazy all during the night. Wake up and just pray pray pray.
I get no support from my family, so I feel alone, except for this place.
I'm afraid that i am not going to be much help except to tell you I have been having similar problems this week. I don't know what is causing it either. I just started taking 50,000 units of Vitamin D and don't know if that could be a factor or not. I don't like this and I take meds for depression and something to hold my thoughts together. This doctor calls it thought glue. It is supposed to help with the symptoms from my thyroid. I feel for you and I am sure you will eventually get to the bottom of this as will I. Hang it there. Linda