As you all know i have started taking sytharoid 25 mg about 3 weeks ago,also the progesterone and vitamin D3 5,000 know i was wondering that if anyone taking sytharoid 25 mg has sometimes have a dizzy feeling while just walking? its kinda like a head rush and takes about an hour to get ride of then i get a headache, so far this week it has happened 3 times, i am not to sure what to do about it, i am gonna call my doctor first thing in the morning, cant today seeing hows its Sunday, any ideas on what this is anyone?