I am not asking about your business, just sharing my issues.
I self-medicated for a number of years, mainly with gallons of coffee in the morning and a couple of twelve-packs in the evening. That habit got super-charged when I started taking Adderall for a while. That was what it was, and it destroyed my stomach and the reflux was horrendous.
Once you get settled with meds, if at all, take a good look at your own habits and diet very broadly. Treatment for ADHD, in whatever form, will give you a decent crutch to adjust anything you need to adjust. (I had to get sober, slow down on the coffee, start running 20 miles a week and much more. Hopefully you have much lighter options and tweaks.)
My stomach has gotten better year-over-year now, so that was a huge plus. Of course, our lives are completely different and my case was a little more on the extreme side. I also am blatantly generalizing folks with ADHD by just implying that most of us have unhealthy habits, but it is not said with ill-intent and simply isn't true for all people.
It may take years for you to adjust your life around treatment and making life decent again with a busted stomach, but don't give up. Time, along with an adjusted lifestyle, can work wonders.
(GERD obviously isn't alcoholism, and I am not meaning to imply that either. Regardless, I sympathize and can relate deeply with your issues.)