Hi Im a 53 years old female, I had the left part of my thyroid removed 10 years ago, Since then I have went from a .025 mg to 137. up down up down, my dr also said that the higher dose of medication the more strain it puts on my heart. Well I was just in the ER due to severe chest pains and the er dr said wow your thyroid level is very high, if that is the case why wouldn t they take out the rest of my thyroid, wouldn t that make it easier to control and regulate?