I have been fighting with thyroid problems since 2009, it goes up and they change my dosage, then it's too low and it's changed again. On the 12th of this month, my blood work showed TSH levels 26.030. My heart is racing real fast, heard to catch my breathe, dizzy, and shaking all over, short black outs. was on 137 mcg of Levothyroxine and now I'm taking 175 mcg. My thyroid does work @ all. I'm tired all the time. Please help me, Tell me what's going on.