Any illnesses besides ibs that cause diarrhea, loose stool, cramping, upset stomach, and occasional constipation? no vomiting or blood in stool.

Yes: There are other conditions that need to be consider and rule out with all those symptoms. Hormone imbalances such as Thyroid hormone, anxiety/stress, GI motility conditions and others can mimic IBS.

Irritable bowel: Watch to see if your symptoms occur after having milk/cheese/yogurt. You may have a lactose intolerance. If symptoms occur after eating bread/rice/cake you have be gluten sensitive.