As Kimberly said, every lab has a different “normal” range, so you'd have to refer to your lab results in order to see how far off of normal you are. Her suggestion of requesting hard copies of lab results was the best advice I got when I was first diagnosed. I used to have to request them from my endo, but these days you can get them online - much easier and faster. (I no longer have to wait for my appointment). I keep all my results in a spreadsheet so I have easy access to info on how my disease has progressed and medication dosage changes.
If you've only been taking the Tapazole for two days, it wouldn't have had much time to take effect, and your disease has been continuing to progress. I wonder if the soreness you're experiencing could be from your exercise routine. You should definitely talk to your doctor about it. Graves' causes you to lose weight, and some of that weight is muscle. If you're doing strenuous exercise, your body isn't able to recover like it did before you developed Graves', so you could be actually making yourself weaker. If your case is really mild, your doctor may give you the okay to continue, but general advice for new patients (while they're still hyperthyroid) is to stick to mild exercise like walking.
In addition to stress, another thing that is theorized to contribute to the onset of Graves' is low Vitamin D levels. I had tested low in the past and wasn't taking my supplement when I first developed symptoms. I tested low again later, so I'm sure I was low at the onset of my disease. You and your sister might want to get your D levels tested. You don't need to live in the frozen North to be deficient in D, either. I live in Phoenix.