Hi knots - glad you found us!
As you will soon notice, this forum is a wonderful support system for those of us dealing with Graves disease, and the curves it can throw at us - you are truly never alone here. Muscle issues have been a complaint of mine, too. I found this article encouraging, and hope it will of interest and encouragement to you: www.ncbi.nlm.nih.gov/pmc/articles/PMC1736982/
And yes, I do remember that disconnected feeling you describe - for me, it felt like watching life go by, from behind a plate glass window - strange and unsettling, for sure. Notice that I typed “felt”, because little by little, I caught glimpses of my happy self returning, and thankfully, it did!
All the very best to you on your journey - the right thyroid hormone levels for each of us are “where it's at” - hope you find yours, and your goldilocks dose of your medication, really soon!