What started out 2 days ago feeling like backache and menstrual cramps became severe lower abdominal pain (on the right side), vomiting, and diarrhea. I have had a low grade fever 100.8, headache, chills and sever joint pain. The vomiting and diarrhea have subsided, but the pain in my lower right side continues, as well as the joint pain and fever. The pain is a burning, achy, pain about 3 inches below my ribs on the right side and in my back. Is this just the flu? or should I see a Doctor?