Thank you for the query. It would have been helpful had you mentioned your age and whether you suffer from any co-morbid conditions like Diabetes. From the history that you have provided, I understand that you are having a bloating and discomfort in your stomach specially after eating. I would like to enquire whether you are having any nausea/vomiting or altered bowel habits along with this. Such symptoms may arise in a acid peptic disorder or a pathology in the gall bladder (early satiety). I would suggest you to get some basic tests like - haemoglobin and liver function test. If you have not been screened for your blood sugar before, you can do that as well. A USG of the upper abdomen may be helpful. I understand your concern about Colon cancer, but it is usually associated with symptoms like - weakness (commonly due to anemia), altered bowel habits (constipation/alternating diarrhea) and weight loss. Since, your visit to the gastroenterologist is coming up, a thorough clinicaal examination will be carried out. However, if required, an upper GI endoscopy may be done along with the colonoscopy. Hope this helps you Regards Dr Ayusmati Thakur