Never thrown up from drinking, now having stomach/acid reflex problems

Hi guys! For some background: I’m 19 f I recovered from alcohol dependence when I was 17 after extensive inpatient programs. Throughout my extensive drinking career I have never once thrown up from alcohol. When I tell people this they assume I never drank enough to, I assure you, you’re very wrong. I am a skinny person, often wouldn’t eat before hand, and just had an extremely high tolerance naturally. That being said my liver was pretty badly damaged before I stopped being dependent on alcohol and I was drinking more than most grown men would on their birthday 4 nights a week.

Now that im 19 and was sober all through being 18 I started dabbling into alcohol (I know, bad) but not like before I have only had a drink once every other week and got drunk a handful of times. But I’ve been having some pretty nasty stomach issues. I wake up every morning with a stomach ache, I have severe heartburn some nights and I even fainted the other night after having ONE shot earlier in the evening that caused such bad heartburn I collapsed. But the heart burn happens even after weeks of not drinking.

Has anyone experienced something similar or think these problems could be related?