I have periodic heart racing. I have had thyroid problems and took the radiation pill. My numbers all came back normal. I am gaining weight quickly. I just came from the Endocronologist who said all is normal I have goiters but not hypo or hyper. My bp was 114/72. Yesterday I bent down to pick something up and became out of breath and then my heart started racing followed by sweating and tingling in my jaw. I thought I was having a heart attack. Took two extra bp pills of medtoporol 50mg each. I didn t feel right almost all night. After sitting on the couch I got up and started to walk and thought I would faint. Today I felt fine no symptoms. I am under a cardioligist care but he can t find a reason for this reoccuring either. I am besides my self. I can t stand this weight gain I am beside myself. I can t go to the gym because later in the day my heart starts racing.