A: I guess you know that methimazole is a medication used when you have Graves' disease and hyperthyroidism. In the early stages of Hashimoto's, some people might have a low TSH. I would check with your doctor to test for thyroid antibodies, including TSH receptor antibodies that can test for Graves' disease. I would also test for TPO and TG antibodies that test for Hashimoto's, and then also look into the possibility that you may have Graves' disease. Here is my article on Graves' that you may find helpful.
Many of the triggers are very similar. I will say Graves' tends to be a little bit more straightforward for getting into remission than Hashimoto's. Sometimes the cause might be an H. pylori infection, and it might be pretty straightforward to resolve.
As far as methimazole being tough on the liver, it can be the case. Some people do tolerate it very well. Generally, I prefer looking at the medication options before doing something like radioactive iodine or a thyroidectomy in Graves' because those tend to be much more permanent. There are many ways you can try getting Graves’ disease into remission if you are symptomatic. If you have an elevated heart rate, and if you're seeing a lot of symptoms, then it may be a good idea to start taking medications.
However, if you're feeling like you're not really having symptoms of an overactive thyroid, you may want to get a second opinion and do a little bit more advocating for yourself and a little bit more research before making decisions.