My Endo said FT4s @ 25.5 too high & TSH 0.2 low plus history 5 mths shaking,high BP, AF, nausea, wt.loss etc. Adv to reduce dose to 75mcg from 100mcg. Still felt dreadful - so GP adv. to reduce to 25mcg after 3 days stopping - TSH 8 ,FT4 10 I felt well. After 10 days on 25 mcg started with High BP tremors,anxiety again. I've been on Levothyroxine for 8 yrs & last Oct had a bereavement - could this shock have affected my body to produce more thyroxine?