Peti mal turned into grand mal?


Has anyone had this?

i woke up having a peti mal. It wasn't going away, I got out of bed. After 30 sec's it triggered a grand mal. My neck twisted, but I didn't fall down. After 20 secs it stopped. Has anyone had this before. It was scary. 

I am am taking epilim sodium vaporate. can this be a one off? 

Any advice or help would be greatly appreaciated.