Metoprolol Tartrate and thyroid

I'm taking 125 mgs. Metoprolol per day. I've been on that dosage for approximately one year for skipped heart beats (which were very scary). Now I'm hot. Constantly sweating. It's unbearable. I can't stand the heat! The only time I don't sweat is when I'm not moving. I didn't associate it with the Toprol until now. The doctor has been running tests for thyroid, infections, etc. But it doesn't feel like an infection. I'm just HOT. And after reading some of your side-effects, now I'm starting to put it all together. I've been going through some weird sleep problems that I've never in my life experienced. Never had a night I didn't sleep right through the night...until now. So to sum things up: sweating bad, sleep disturbances and slight depression.

I needed Metoprolol Tartrate for a very high heart rate for graves desease, I was in the 115's+ lowered too 8o beats per min. Which is great!
BUT, having some horrid side effects.
BAD night chills, intolerance to cold. Shake for 3+ hours then sweat. Feels like I was hit by a train after then I get very nauseasous and light headed
Sleep is bad, toss and turn all night and have a greater fear of the dark
ALSO, my bones hurt all the time!! Never did before, had tests done nothing there.
This is the only drug I could find that didn't make my heart flutter and feel all funky. Its a great drug for just that. All the side effects suck..bad