I have had a similar experience; GERD, gastritis & swallowing. I also have facial flushing; intolerant to sucralfate & Famotidine. Please check out the Histamine Intolerance websites. I am on a DAO supplement now ( histamine blocker & low histamine diet), w/a PPI and it has alleviated 70% of my issues. Currently being tested for IBS & SIBO. Returned to my Homeopathic doctor who is helping me detox my GI bile system; gallbladder a major issue. I have developed a major intolerance to many foods due to my underlying GI Issue / Portal hypertension.
Please check out the low histamine diets-but I would recommend a GI specialist who is versed in nutrition. Also, maybe have your doctor run a 24 hour urine histamine test to check for histamine levels.
Best wishes for a healthy resolution.