I have Hashimot’s thyroiditis which means my immune system is attacking my thyroid gland causing it to not produce insufficient hormone. The medication Tirosint is the same as is in Synthroid. The difference is in the consistency of the amount of hormone in each pill. Synthroid may be better now but it used to be inconsistent in the amount of hormone in each tablet. If you have good results with Synthoid, then I would not change. I don’t understand why your doctor said that there is not a medication for Hashimoto’s because Synthroid is one. Some people are hypothyroid but do not have the autoimmune disease Hashimoto’s. They get the same medication and have the same issues as those with the autoimmune condition. Please forgive if I am stating information that you already know. I am happy to share with you any thing I can that will make your life better. I don’t know if you know this but if you have one autoimmune disease then your odds of having more are increased. Good Luck!