I am suffering from Epigastric pain…what’s wrong?

I am 20 and I have bloated abdomen feeling for months especially at night, and if i cant pass out the gas it will cause pain in my upper abdomen (in epigastric). usually the next morning I’ll have loose stool. sometimes it last for a week then I am having a normal bowel movement the next week. it seems like eating milk trigger this bloating but I’m not sure myself. Whats wrong with my digestion ?

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