I suspect the doctor would already be aware of the possibility. You could mention it though. If the doctor has considered it and ruled it out, it might give you a sense of relief. Then again, the doctor might have it in mind and being able to discuss it without scaring you (you’re already about as worried as you could be) could be a real benefit to him/her.
I do hope it’s not MS. But then MS might be the better option than some others. The trouble is though that MS and thyroid problems go together.
There are so many autoimmune diseases / disorders. Many of them fall into groups where they’re more commonly seen together. MS and autoimmune thyroid disease (ie Graves - I’m not sure about TED) are very common. I had Graves’ disease years ago. It was fixed by subtotal thyroidectomy and I now have underactive
thyroid as a result (very common as the surgeons prefer to take a bit more thyroid as opposed to not enough). Ten years after Graves’ was diagnosed, and 8 years after the thyroidectomy, MS entered my life.
So while it’s not something that you are bound to have/get, it’s not impossible.
Best of luck. I hope what I’ve said doesn’t add to your worries. Let me know if so, we can talk about the chances some more.