Temporary pain from most supplements?

I have severe gastritis and I noticed a lot of supplements give me temporary pain for about an hour after taking. For example Pepzin, DGL, even some probiotics seem to trigger it. On the other hand some like slippery elm and mastic gum either give a very mild reaction or none.

The feeling is kind of like burning just an uncomfortable sensation that completely passes after an hour. I ask because I want to keep taking some of these supplements. I’m wondering if what I’m feeling is the body adjusting or is it something else?

Perhaps someone here had similar experiences.