Thursday I Started Feeling Like I Was Constipated (felt Like

Thursday I started feeling like I was constipated (felt like my lower abdomen was about to have a baby), I noticed that I started to get pain in my stomach area, it would subside each time I went to the bathroom and increased when I ate anything. I was out of town, so when I got home I thought I would take Dulcolax (3 tablets) drinking the full bottle of water it required. I woke up around 3 a.m. barely making it to the toilet. The diarrhea kept coming and coming. By 4 a.m. I was able to go lay down, woken up by 4:40 then throwing up, switching each end on the toilet for approximately 10-15 minutes. I went back to bed, again with severe pain in my abdomen yet, not feeling that full stabbing pain, more of a cramping pain. I have been drinking lots of water, a small bottle of sprite, and a cup of tea. I think it could be the flu, but I don't know anyone with these symptoms. I do not appear to have a fever, though I do feel achy. I am hoping it is just that... the flu -- but I also wonder if it could be diverticulitis or appendicitis.