Methimazole Beta Blocker, Propranolol, Thyroid, Headaches, Second Time

I have been taking Methimazole for exactly 1 week. I am 26. This is the second time to take these same drugs. Methimazole along with a beta-blocker, Propranolol. My thyroid had been back to normal for 2 years. This time, I started off taking one three times daily, then just one a day, now I was instructed that I should take three once daily. My tests just came back and I am extremely thyrotoxic and have Grave's Disease. I have had headaches on and off this week, today I have had a headache most of the day. My heart is still palpitating but my strength is coming back. Last week before starting the drugs was much worse. I could barely move my body hurt so bad, felt like I had a fever, fatigue...the works