I also started to use Probiotics, but the ones you buy off the shelf didn't do the trick so I purchased some from my pharmacy that work Great. They have to be refrigerated.

Gastritis, I think, means different things to different people. I had various symptoms, or ‘stomach’ issues. I read a book called The Keystone Aporoach and it led time to do two things, take coated peppermint pills (empty stomach only) and probiotics (I chose Pro-50) and my issues are 90% better. I am not recommending you do any of this but rather read the book if that sounds if interest and see if there is something that rings a bell.
Most importantly you may want to see a doctor if it persists. I hope this helps:)

I have terrible stomach problems! I have IBS and Diverticulitis. Lots of gas and diarrhea. No fun!!

And am in hospital admission

Ok thanks my dear.Its severe chronic gastrisis. Am currently using probiotics