looking for tipos for gastrointestinal and acid reflux problems

hi guys, im not sure this is the place to ask this questions but I was addicted to monster for 4 years, drink 6 days a week 2 times a day, I always drank monster ultra zero sugar so sugar wasn't really an issue, anyways I finally kicked the habit and I sometimes drink half a can if I feel like it. But I guess that after everything I fucked up my gastrointestinal system and I have problems now with acidity. Like I can't even have a cocktail because of how much my body resents acidic (?) drinks. If someone here has experienced the same let me know if you have any tips. Tomorrow im buying probiotic supplements with the hope of restoring my intestinal flora.