Within the last year or two I get this sharp feeling inside of me, it comes and goes throughout a day every couple months. It feels like someone's jabbing a knife downward through my bellybutton and just twisting it around inside. If I'm sitting down it hurts too much to get up and vise versa. It spreads from my bellybutton and downwards and while it's happening I can't even pee because it feels like I'm tugging on something. I'm not sure what it is or what sets it off but it's really painful and it scares me. Has anybody else ever felt this or know what I'm talking about?