Hi there, I found this article online and am having very similar symptoms. Have you ever found an answer for this? I am currently on a heart monitor and feel like it’s related to GI issues. I also have pain in temples and feel like my stomach sinks. I also have a lot of sinus issues and when I blow my nose it feels like my ears block and I can’t breathe until I swallow which spikes my heart rate. Just wondering if you ever got this figured out.