For The Last 3 Days I Have Had Lower Abdominal

For the last 3 days I have had lower abdominal cramping, gas, bloating - no nausea. When it started I had the runs and I would get the sweats, and then took Imodium and the runs stopped. The first day I really didn't eat much at all but kept hydrating. Started a limited BRAT diet day 2-3 (only had some applesauce and toast)- but now as I try to eat more (I am getting hungry) I am still getting extreme lower pain, cramping and gas. Lower back hurts as well. Very tired. I only took the Imodium if I felt cramping as I don't like to take too much medication.
At night i can't sleep as the cramping is continuing throughout the night.