There seems to be some type of virus going through my house. I first thought I had eaten something that had made me sick, but then my son had the same symptoms and now my other son is in the same situation. Stomach cramps followed by diarrhea, continued sharp cramps in the stomach with bloating. Dizziness. My youngest son, 11 is experiencing vision issues, temp black vision then returns to normal. Is this just a stomach virus?