For the last 3 months or so I seem to feel my heart pounding probably about 90% of the time. It seems to be worse when I lie down so consequently I'm not sleeping well. My pulse doesn't seem excessively raised - mostly it's around 60 but sometimes it does seem to speed up for no reason. I also get aches and pains around my chest and arm (left side only). I've had several panic attacks because these symptoms are really frightening me and I'm worried there is something wrong with my heart. My gp thinks this is all caused by anxiety but I think it's the other way round. I am feeling really unwell at the moment and I know I'm hypo - Last bloods from September were tsh 10.7 (0.27-4.20), ft4 13.3 (12-22), ft3 3.1 (3.1-6.8).