For a few months now, I've been experiencing a painful stabbing/tugging feeling behind and around my belly button. It usually occurs a couple hours after I've eaten and it lasts for a few days and then stops. After a couple of weeks, the pattern begins again. It feels a bit like stabbing, but also kind of like all of the insides right behind my belly button are being crushed in someone's fist and then aggressively tugged on. Has anyone ever experienced this before, or does anyone have any idea of what this could possibly be?