Calmo is my best friend. But when things are raw, from stomach acid and bile that have not been reabsorbed, even calmo or other barrier creams are not enough.
If you have diaper rash (candidiasis of the skin), everything burns and is completely miserable. I made a cocktail of zinc based barrier cream, ketoconazole ointment (prescription, but your doc will call it in for you), and lidocaine ointment, and it got me through a few really horrible days. If you want to keep them separate, put on the lidocaine first in a thin layer, and then ketoconazole, and then zinc cream/calmo.
If you are like me, you have the joy of leaking bile and stomach acid every morning. I find that this can be mitigated by eating something that absorbs it well (complex carbs, fat, etc.; eggs make mine worse) so you’re not just passing it out of the body. I also had to give up eating large quantities of tomato sauce or tomato soup, because they increased the burn.
Controlling stomach acid production can really help, as it sounds like you have discovered. But irritated skin needs to heal; I get tears from all the wiping, and that makes the burning that much more fun. Reapplying barrier cream each time is tedious and messy, but it does help. If you have a rim of irritated skin beyond the anus (you’ll know because it will feel raised and painful on either side of the crease), the cocktail of creams can help get rid of that. If you have liquid leakage, I’ve been told that some people put a gauze between their ‘cheeks’ to help keep it off the skin. Skin doesn’t like stool. I remember how horrid it was every time I had a stoma leak with my loop ileostomies... my skin was burned raw from the effluent. It was so miserable... and then the barrier flange doesn’t stick well, and there’s more leaking...
Don’t eat spicy food. That is something I learned the hard way. I can’t even handle a jalapeno anymore. Without a colon, the capsaicin (the hot stuff in peppers) doesn’t get neutralized before passing out in the stool, so it is free to burn the perianal skin. I call this ‘fire-butt’. Every time I eat something a little bit too spicy, even if my palate thought it was fine, I pay for it horribly. Serious fire upon exit. There’s not enough Calmoseptine in the world to make that better. I am so careful now... only have spice if there is coconut milk or cream or something to make it mellow, and keep it to ‘gringo’ levels!!!
I think a bidet is a great thing to reduce the skin irritation from wiping and to help with cleanliness of the skin. There are bidet seats you can install onto your existing toilet, and they come on big sale periodically at Costco. They look so fancy... I want to try one. My aunt and uncle have them in their house and will not go back to paper. I use an inexpensive squirt bottle with a curved spout—a chemistry type bottle so it squirts at an angle easily—to wash when it’s too irritated to wipe. But I don’t love the cold water in wintertime, so the bidet (which has heated seat and heated water) sounds much more civilized!
Best of luck...