YOu are experiencing the effects of an undertreated thyroid issue, join the club, I also was a synthroid sufferer for many yrs. You need to switch to armour thyroid . Many doctors will tell you its old school , outdated, etc.. but you tell them that its your money and its what you want to try. Armour is a natural thyroid hormone, from a pigs thryoid , safely made at forest pharma. it has t4,t3,t2,t1, and calcitonin.Synthroid only is synthetic t4 and leaves us sick ,and makes us look like we are nuts every time we go to the docs they think we are hypochondriacs ,because it doesn't work ,Yes it might get your levels somewhere in the lab range, but not optimal, and it doesn't work for so many people. I switched to armour in june and I also take lugols solution iodine ,and other supporting nutrients.
The armour had relieved my symptoms within a few days, I have had a few come back lately,(nothing like when on synthroid though) but I am still working up my dose, my doc is a little slow at upping my dose. The lugols iodine has taken away all my heart palps, and gives that extra boost of energy , the thyroid NEEDS iodine... The RDA is WAY to low, look up Drs. Abraham and Brownstein, for iodine/thyroid info and all the research.
Iodine is being used in cancer treatment too, thyroid , prostate, breast, ovarian, also fibromyalgia, pcos ,heart issues....