Violent & Painful Jerks While Sleeping.

So I have had those jerks that most people get in dreams and you get those jerks that wake you up. But last night I experienced something different. I have had trouble sleeping for 5 years now. Never have I taken any prescription sleeping meds, mostly because I don't have a normal doctor. Anyway last night I was having my usual hard time sleeping. I take Sominex like I usually do (2) and seemed tired. As I started to go to sleep I got a very violent and really painful jerk. It felt like something had tightened my whole back and neck area and even to my finger tips and toes. Like a "shock" of sort. It would wake me and my fiancé up and it continued to happen over and over, every time I felt "relaxed" it would happen. It got so bad to where I simply was in pain from the whole thing. I can't seem to find anything about it on the internet and would love to hear any feed back.