I once had a 'colonoscopy' (is that the right word?) during which a TV camera was pushed up my rear end (not one of those big old BBC jobs, I hasten to add - that would have required rather a lot of vaseline - probably more than the National Health Service could afford!). Anyway, the doctor found these little pockets in the lining of my bowel - and even showed me on a TV monitor (a bit too much information, but I'm sure he mean't well).
Over the last few years I've had some problems with my health - only occasional pain - but I can feel generally lousy for weeks at a time. I'm not sure whether these episodes are related to the diverticulae, or not, and the medics don't seem to know either. Nevertheless, there are foods that I have learned to avoid (not too much bread and no cheese, for example). On the other hand I have found that eating porridge (ie. oatmeal) for breakfast does help. I put half a cup of oatmeal, in a deep ceramic bowl. I then add a cup of skimmed milk and half a cup of water. After stirring I microwave it for 4 minutes and then add a couple of teaspoons of honey - it tastes quite good as well (although I never would have believed it until I tried it).