Didn’t Gail Devers compete in the Olympics after her bout with Grave’s? An extreme case, but I remember seeing an interview with her years ago where she talked about how bad her leg problems were. So at least there’s one example for you of someone who got past it.
Are you sure you’re not overtraining? What type of leg exercises are you doing? Maybe it’s worth meeting with a physical therapist (I would say personal trainer, but I don’t have faith that they’d understand all the intricasies of Grave’s and what it can do to your muscles.)
Good luck!