Why does my upper stomach burn very bad while drinking?

So I first discovered that my stomach started burning while smoking weed. I also felt like I was going to puke everywhere with the burning recurring every 30 seconds or so. I just assumed that it was cannabinoid hyperemesis syndrome(CHS) I just drank two twisted teas and i got that really bad burning sensation again. I’m wondering what could be causing this. I have also been having only diarrhea for the past 6-8 months if someone can make a relation between them.