H pylori/ POTS symptoms/ high heart rate

For 2 years, i have been suffering from undiagnosed illness thats making me to give up everyday. It all started when i get gas stuck in throat, puts pressure on my upper abdomen , struggling to burp it out. This triggers fast heart rate , anxiety, panic attacks and tremors. I did an endoscopy and they found mild gastritis and mild gerd with no ulcer or anything. Tested positive for h pylori. Took a round of antibiotics with low fodmap diet. Still the problem persists and im still taking ppi, gaviscon, probiotics (Saccharomyces boulardii CNCM I-745), kefir, bone broth, poached chicken, banana, apples. My heart rate goes high whenever i walk or exercise with continuous burping, gas pressure in throat. Its really uncomfortable. Checked heart doctor, no issues were found. I am not even eating properly and even water makes the same symptoms. I followed and still following everything but no cure. Im in US. No ones listening.Is it POTS or MCAS , idk. I took barium swallow, it's normal.