For the past week i have had an upset stomach that comes in waves. i have also had diharrea for days. i have no fever though.

Simple diet: It would be good to stick to foods that are easy to digest for the next few days. Bananas, applesauce, toast, rice, broth soups, hot water with a small piece of ginger all can help with stomach upset. If your symptoms continue, see your doctor to look for other issues.

Viral Syndrome: This is most likely due to a Viral gastroenteritis, which is a self-limiting condition unless you get dehydrated. Drink plenty of water, follow a clear liquid diet for a day or so, and then advance to the BRAT (Bananas, Rice, Apple sauce, and Toast) until your symptoms improve. If you are not getting better in a few more days, see your physician.