I am sorry you are having this condition and on such a regular basis. We have a lot to do in life and when a problem keeps impacting us and keeping us from being able to do it easily, it's frustrating. So, in the area you speak of, our pancreas is there. If this happens after a large meal such as dinner, pancreatitis could be the culprit. Your spleen is in that area as well but normally you have issues with an enlarged spleen and you'd feel that (and it usually means you have an infection somewhere in your body so you'd have some other symptoms). Part of your stomach is in that area, liver, etc. That this is chronic but with a pattern, you really need to see your doctor for a complete physical to go over this issue. I think this is urgent and would do this sooner rather than later. This is the type of thing that needs thorough investigation. Likely it is not serious but you want to make sure. Let us know!