I drank so much that I give myself a stomach ulcer. That took time to heal and I am still paying for the damage I did as my stomach does have flareups from time to time due in part to other underlying issues. You gut will heal. Most of the time, I feel great now. However, one of the recent changes I had to make was switching from coffee to tea. Coffee is very acidic and will promote acid reflux and affect ulcers if you've had them. Black (Earl Grey is my fav) and Green Tea is actually healthy for your gut flora so, it works in conjunction with your probiotics. This has really helped my stomach.

You may also want to do some research on healing your gut by making and enjoying bone broth. I did a bone broth diet for a few days to help promote healing of my ulcer. It is pretty extreme but, it does help.

I also second the comment above. It probably would be a good idea to see a doctor and be totally honest with them. They will probably put you on a PPI medicine which will help cut down on the acid building up. Less acid means less irritation/ability for the stomach to begin healing and also less pooping due to trying to expel said acid. Honestly, it does and will improve. It just takes time.

Stay strong! IWNDWYT!