Hi and Welcome to connect, yes I can relate to your issue. I am also someone that can get real anxious when upset or just not knowing why I'm having this strange feeling in my chest. I found that for me it was first to determine if it was my heart or stomach as the symptoms sometimes are almost the same. So when I would feel one I would first check my pulse. I got real good at finding it so it only took a second. If it felt fine I would then tell myself, sometimes if alone I would actually yell at myself , that it was nothing to worry about. But if I noticed some skipped beats then I realized it was just some of those and relax maybe lye down and listen to something to take my mind off of it. I hope that helps and I might note don't feel for a pulse more than a few seconds or you may get anxious just anticipating something is about to happen. Maybe like 10 seconds just to verify it's more likely your stomach and not your heart.
Blessings