I'm 50. I have had Hashimoto's for 20 years and am on synthyroid 137mg, take 1,000 IU of Vitamin D, 1200 mcg B12, daily low dose aspirin 81mg and celexa for heart palps at 20mg. For the last little while, about 2 months, I have NO energy. I started feeling anxious, blood pressure is all over the map and the heart palpitations or racing heart are really disturbing. Hot flashes and cold hands and feet are common, as is the fatigue after an "attack". Shortness of breath happens, but for no reason. I can be walking the dog up a hill and be fine, but having a hard time sitting in a chair. I can be fine for days, then have a day of pure hell. I am confident it is not my heart, although gp is doing a cardiac workup. I went for a stress test and failed miserably at level 3 because I had the flu (spent the next day with fever, diarrhea, upset stomach and didn't eat for two days)...I think I am going loopy. I know my doc sees me and thinks, "here she is again".... Over the last 6 weeks, I even gained 10 pounds and then lost it. May hair is falling out, itchy palms, dry skin....Any suggestions???