What Causes Intense Diarrhea, Vomiting, Headaches, Night Sweats And Overall Muscle Discomfort?

I am currently suffering from intense diarrhea, vomiting, headaches, night sweats, all over muscle and body discomfort, severe restlessness and my temperature has been on the low side for at least a few hours now (95.1). I went to a walk in today and was told it was the flu but it has been 8 days of this and I have never had the flu for more than 3 days before. I am getting nervous that I am not getting any better and I'm not able to keep much food or water down.