Too much gas and flat and thin stool.

Dear Sir /Madam I am having gastritis problem since 13 years. On 2019 September I had undergone surgery for sebaceous cyst on out side anus. After that my gastritis symptoms was high I. e too much gas, cheat pain, motion problem belching, indigestion. Three to four times heart related checkup done all were normal. On 2020 December I had checked endoscopy and blood test. And report says A grade reflux Oesophagitis errosive gastritis and vitamin b12 and d deficiency. I had taken all the medicine for one month. like pantaocid L, renerve plus injection and D tablet. But not much improved. Last year suddenly start frequently dairiah and too much gas. After antibiotic and it's tablet it was resolved temporarily. I checked full blood test and abdominal scan and it says fatty liver and high triglycerides. Last one and half years anus water and pus discharge for that I had undergone fistula surgery on July 2024. But too much gas and motion problem not soloved. Still flat and thin  stool .