I was diagnosed with graves disease in 1995. I am a 51 year old male. was on levoxyl 200 mcg for many years. after the recall pharmacy switched me to 200mcg of synthroid in august. in the past 3 to 4 weeks I have developed hyperthyroid symptoms. irritability, anxious, hyper, occasional dull headache, sensitive to cold, internal body shakes. could this be from the change in the medicine? any suggestions will be appreciated.