Weakness with Graves?

Hi everyone, I’m new to the group. I was diagnosed with Graves back in 2017, went into remission after taking ATD, and now it’s back. I am a lot more active than I was back then and I’m feeling incredibly weak. I used to be able to do 20 push ups with knees off the group and now can barely do one. I also have had to reduce weight when doing squats and lunges. Has anyone experienced this? I started back on ATD 6 days ago. My endo said give it about 2 weeks, but the weakness is making me feel so defeated.