during the past week I have been suffering from stomach cramps, it would be fine most of the day and all the sudden my stomach would cramp up randomly I also have lost my appetite the past week. 

on Friday I became very feverish, I felt very cold and shivering but my body was burning up, I also felt very nauseous and dizzy, the following morning my fever had gone but the stomach pains were still there but a lot more intense. The nausea and stomach pains were on and off throughout the day and I still had a loss of appetite.

sunday I felt a lot better, my appetite was not back to normal but better however the stomach pains are still there on and off, I will be fine for a while and then my stomach will cramp up.

i have also had continuous lower back pain/ache throughout this, does anyone have any ideas?