Hi, I am a tennis teacher and 3 month ago a ball from the tennis ball machine hit me in the left part of my neck (from 1m far from the machine with 100km/h) Two weeks after that I developed tahicardia, fatigue, pain in my muscle, My cardiologist sent me to a endocrinologist and after all tests he decided that I have hyperthyroidism and a nodule in my left part of thyroid. He denied that hyperthyroidism started with that ball, but I didn t have any health problems before.i believes this is the reason.I not tolerate Tyrozol and I don t know how I will deal with this situation.