for the last couple of days. I've been getting headaches so bad they literally make me sick to my stomach. Last night the one I had was so bad. I started shaking it was almost like an involuntary thing like a seizure, I don't know what caused them. they are scary. I've never had this happen before. they come on suddenly and they are intense, I have no idea whats causing them. the only thing I've been doing differently is I've stepped up my treadmill game. I walk on it for about two hours a day. It's not a pretty feeling.