Medical advise please?

Yesterday I had uncontrollable vomiting, diarrhea stomach pains. I was admitted to the hospital where they did some tests. They said I had an elevated number of white blood cells. Also, the ultrasound I took was inconclusive to appendicitis's. I also took a CT scan of my lower abdomen. The doctors said that looked normal. They said I still have a small chance appendicitis, regardless of the test results. They discharged me from the hospital with diarrhea and vomiting medication. The pain in my lower abdomen has returned since the pain medication they gave me got out of my system. I am convinced that this is more than the stomach flue, like the doctors said. I had a flue shot this year, and this pain is like nothing I ever experienced before. Last night the pain, before the painkillers were given to me, was a 10 out of 10. This morning, maybe the pain is at a 7 out of 10. I am still in a lot of pain, and don't know what to do. I am thinking about going back to the hospital. What do you think I have?