This has happened to me many times over the last few years. But it used to be like maybe five times a year. Since I changed me eating habits and started working out and loosing weight it has been happening a lot more often. I just get this horrible feeling inside. I can't really explain it but it is not a good feeling. It is under my ribs on both side. If I sit down and not move it will go away but if I get up and start moving around again it come back. But normally if I eat something then it will go away and not come back. I know most of you will say go to the doctor but I have no insurance and can not afford to go to the doctor.