I'm so sorry to hear you are experiencing all these GI issues. My son, who is 28 now, dealt with chronic GI issues most of his life. He has a peptic ulcer, eosinophilic esophagitis, pancreatic insufficiency, GERD, chronic constipation, gastritis, and an issue that they notated was " due to a previous viral insult" but they could never say more than that. We did endoscopes every year. He was on a gluten, casein, dairy, wheat, soy, and corn free diet for 7 years. That did help with the symptoms. He took many different medications for the reflux, pancreatic insufficiency (enzymes), constipation, and the ulcer. So many that I can't name they all. We did elevate his bed at night to try and help with the reflux. Anyway, long story short, after keeping him on the diet for 7 years, his endoscope came back clear two years in a row. We reintroduced the foods during that time and no issues. However, he does still get reflux and is on pepcid daily. The chronic constipation was the worst. He could not use the bathroom without a glycerin suppository, even though he was on Miralax and extra fiber. We found a new gastroenterologist. He kept my son on Miralax but recommended an OTC med called Prunelax. The instructions were to use the Miralax daily and take 1 Prunelax daily. We could go up to 2 Prunelax daily if needed. Well, we DID NOT need to go up. In fact, we had to decrease the dose to Prunelax 4x a week. Since starting the Prunelax, he uses the restroom everyday without issue. Just an FYI. He does take a magnesium citrate supplement. For severe constipation, our GI recommended keeping OTC liquid magnesium citrate on hand. I hope this helps. I wish you all the best.
Kerry