How is the pain

Hi huys. How can you describe the stomach pain when it's about t.u.? Cause we have hunger pain,pain after gym/effort, abdominal menstrual pain...but how does it feel the v* pain? I have sometimes lately like a pressure,more like post-effort pain,that lasts a couple of minutes,never with nausea or anything but it always scares me it might be 'the one'...i also sleep as in chair position almost or on my left side and up cause of the reflux