I'd typically suggest betaine HCl plus pepsin for this - cheap and often effective. Reflux paired with burping sometimes points to low stomach acid. If your pH isn't dropping enough, it won't signal the esophageal sphincter to seal. Though with reduced gut motility, you might be dealing with...
Anyone tried topical GHK? I wanted to start but fell down a rabbit hole reading horror stories about skin damage. Curious what worked or didn't for people here - dosage, mixing with other creams, the whole thing.