What illness causes chills, stomach ache (cramping & bloating) and frequent bowel movements?

How long?: A viral illness and/or food poisoning are probably the most common causes of those symptoms but that usually moves thru your system in a few days. If this has been going on longer than that you should see an md for a work up. There are inflammatory colitises, food intolerances, parasitic diseases and other diseases that may cause the same symptoms but over a prolonged period.

Diarrhea: Your symptoms speak to a possible infectious diarrhea like salmonella or shigella. Make an appointment with your doctor asap or go to the er so a culture can be taken and you can be started on proper treatment.