I have been wondering about this allot, :/ I'm kinda worried about my girlfriend because at random ( not excessive but it's from time to time ) she will just start shaking almost like an very mild seizure but only lasts for about 20 seconds to a minute then she is fine again starts off slow and on her hands then moves around to where it's her whole body shaking doesn't get cold but what i believe to be a side effect of the shaking(random guess) is also at random has severe headaches in the back of her head and some fevers any suggestion's on what would wrong or symptoms....anything really I'm just worried im pretty sure it's nothing serious but still.....