I am not on any meds but i just found out i have hyperthyroidism. my body seems to be shaking from the inside. Kinda feels like a car that is in idle. Feel it in my core and sometimes my arms. When I wake up in the a.m. I am always shaking. Does anyone have any experiences with this? Are these strong tremors. Also feel tightness on neck and chest. It is so distressing to me that I have been taking anxiety med. I don't like not feeling in control of my body.