occasionally i would say about 3-4 months apart i get really bad tremors , i shake so much that my muscles are sore the next day. it usually happens when i'm laying down to sleep, and lasts between 15-20 mins. I do get a little pale when this happens but my heartrate doesn't seem to change. the whole attack is followed by a mild <sicky feeling> upset stomach. any awnsers would be very helpful.