Hi Mark, I am roughly in the same boat. Turning 59 next week, have had a GD diagnosis for 1 month. I just began methimazole and haven't noticed any changes yet, but it takes awhile. I was also put on metoprolol, a beta blocker. I still try to exercise. My jogging is way off, I will jog a mile and then walk home, whereas I used to jog 4 miles, no problem. I swim on alternate days, still 1 kilometer in the pool, that hasn't changed, although I noticed that when I swam in the ocean earlier this summer, I didn't have the strength I used to, so I am sticking to the pool for the time being. My symptoms were weight loss, hoarseness and excessive thirst, which has moderated somewhat. I hope you start feeling better.