Occasionally there will be a rumbling/gurgling feeling on my left side, around the area underneath my breast. i've gone to the hospital and had an ekg, ct scan and chest xray and everything looked fine. could it be indigestion from anxiety?

It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!

At age 16, likely anxiety as a major factor to consider. AnECG, CT scan and chest xray for the symptoms you describe sound excessive for the symptoms you describe. Your primary MD with adequate experience may have been able to avoid these expensive tests after an evaluation of your symptoma.