I had the radioactive iodine tx. a few years ago due to Graves and as of lately have been very bad at taking my synthroid. I had a TSH done last week and it was 136. Yesterday, I started taking my synthroid again but went right back to my usual dose of 175. Today I feel not so good: anxious, hot, headache, diarrhea, short of breath (anxiety), didn't sleep well last night. I'm thinking it's because of the blast of TSH I received from the synthroid. Does that sound right? If so, I assume I should taper up to the 175 dose? Does anyone know how long these symptoms will last? I feel miserable and am so mad at myself for my negligence! Any help is appreciated. My M.D. is out today, so thought I'd start here.