Hi, first time on this site but so good to read of others with similar symptoms. I have had hypothyroid for 13 years and have been able to keep it under control until recently. Not sure what's happening. I have been waking abruptly in the night with a rapid pounding heart that causes instant anxiety. Sleep is very interrupted. My doctor told me to stop the thyroid mess for a couple days. I always know, here we go again, is my thyroid going hypo or hyper. I had been enjoying using an infrared sauna however it seems that that is when everything started to change . I really hope that the sauna isn't what has caused these changes. Usually my hypo symptoms were extreme fatigue, constapation, hair loss but this time I'm having rapid pulse, profuse sweating night. Has anyone had these same symptoms? I am due to have blood work but until then it's been a rough week.