Stomach Flu Treatment More Condition_symptoms Stomach Flu?

Stomach flu? - stomach flu treatment more condition_symptoms

This morning my friend woke up with terrible pain, specifically in the neck and back. In the course of time had diahrea more than 3 times and want to vomit every time. She was so weak he can barely walk a few steps forward, it needs to sit or lay down again.

Is this the stomach flu?

What can I do to help? specific treatments that can be used?