For about two years, I get upper back pressure on my left side. It feels as if someone put a foot in my back. That feeling makes me feel like I have a really strong burp, but I don't. I also feel the pressure in my throat. Quite often, the pressure is associated with severe pain in the pack and stomach region, which leaves me groaning, bending over and taking deep breaths. I have had chronic gastritis, (which I learned to live by means of diet) since my teen years, am now 30, but have never felt the back pressure. I notice the feeling comes on about 3 hours after food I but not always. I often strikes when I am hungry and sometimes develops as I eat. I eat healthy, do not smoke or drink. I cannot figure out any pattern like particular foods or certain times, beyond the 3 hour after food part. I sense that this has something to do with my stomach or pancreas. Any suggestions?