Have a question about my throid levels (TSH) taking synthroid? Normal levels are suppose to be 0.40 to 4.50. August of 2013 my level was 1.62. It was just checked this week and came back at 8.65. What on earth could have happened to make it go up that high and that fast? Synthroid increases my anxiety level. Is there anything natural to help it? Taking the generic. Had my thyroid removed 3 years ago and the level was fine then. It's a mystery ...