hi sammi, yes i have. i have hashi's. and yes, i've feel that shaking, teeth chattering cold feeling. sometimes i can't even control my shakes. i just lay there in bed with the covers on me and i'd just freak myself out cuz i couldn't control those almost "seizure like" shakes. this was before i was on thyroid hormones. i haven't had it since i've been on synthroid since may.