41 yr old female (5'9")in good health. DX 1990 with Hashimoto's Thyroiditis. All symptoms classic of Hashimoto's except a 30lb weight loss in 6 months without dieting. Beginning weight 147lbs down to 117lbs. Maintained 10 yrs on 0.175mg Synthroid and weight leveled out to 132lbs +/- a few pounds. Developed hand tremors, heart palapations, irritability so dose lowered to 0.150mg and maintained for approx 6 yrs. Again developed severe hand tremors, heart palapations, drastic weight loss, insomnia, etc. TSH level 0.01, T4 25, T3 4.7 so Sythroid has been adjusted to 0.125mg.
My Endo. retired just before my first problem tolerating the med 6 yrs ago and my GP is hesitant to refer to another Endo.
What causes the body to suddenly not tolerate the medication as well as before? Nothing in my life has changed whatsoever except the normal aging process. I do not take any other medications and am otherwise healthy and fit. Should I push to see a specialist or check for underlying causes.