Pain left side near heart

39F, normal weight (BMI 21-22) normal blood panel, cholesterol levels etc.Since this morning (live in EU)i have pain on my left side near the heart, sometimes radiating to the left side of my belly and back. It’s a kind of shooting pain that gets worse by trying to take a deep breath of while eating. It was away for a couple of hours when i sat down and then walked but it’s back after eating lunch. I’m not officialy diagnosed with GERD but i do have symptoms. My energy levels are good and don’t feel bad. Still worried it could eb somethinf related to the heart. I also have anxiety induced intermittent diarrhea and some other problems with my tongue (similar to the burning mouth syndrome).