Fever and electric shock conditions.

Hii doc Today morning my daughter was with a fever of 100 degrees and she was sleeping, we noticed she started moving after sometime, when i went to her i found her body totally tight n was moving like fits or electric shocks!!!! And yes.. froth coming out of her mouth!!! All this went for 3-5 min . We were with a doc in nxt 15-20 min n till thn my daughter was not able to speak anything!!! When the paediatrician came and see her... n pinches her hard she started crying n able to speak!!!! What all was that!!! Never saw or hear such with a kid till date!!! Being a father am worried a lot!! Can this happen again?? Was it a symptom of any disease ?? It was not happened to my daughter till today morning!! Help me out please!!