Hi!
I can understand your concerns. While, it is good to avoid CT scans etc, the ones you have had may have increased the risk for cancer. But a direct correlation is difficult to make. Also, just because you have repeated scans, it does not mean you will get cancer. Your symptoms can be due to several factors.
Chronic diarrhea can be due to parasitic infestations. Other causes are irritable bowel syndrome, celiac disease, Crohn’s disease, malabsorption syndromes, pancreatic diseases, diabetes, hyperthyroidism etc. If celiac, Crohn’s and other problems have been ruled out then lactose intolerance and IBS are the possibilities. Gas in stomach, burping, diarrhea all go in favor of IBS. Pancreatic enzyme disorders, liver dysfunction, HIV, cancer of the gut, and infections by parasites other than giardia can all cause persisting diarrhea. Lyme and lupus are other possibilities that present this way.
The stool color can vary with diet. If your diet does not have fiber, fruits and vegetables, it is likely to be pale colored. Also, liver and pancreatic disorders can cause pale stool. Also, since the symptoms usually start after drinking, it can be alcohol allergy or liver or pancreatic disorder. Please discuss this with your doctor (GI doctor).
I sincerely hope you will find this information useful in your journey towards better health.
Hope you get well soon! Good Luck and take care!
I should also add that my stool color for the past few months has been a light brown. No obvious signs of bleeding.