I burp a lot when I drink liquids like water, ginger tea. When it gets too bad, I take Gas X, it dissolves the gas bubbles in the stomach, even Dr Oz recommended this product on TV.
If I don't burp, I get pain in my chest from the pressure from the gas.

I have the burping frequently. I also have hiccups from time to time.

Oh yes, me too. I take Phazyme when I take Zantac. It helps because a lot of my pain and cramping is due to pockets of gas that won't move. This morning, before I took any medication, I burped and acid came up with the gas. So my throat is sore now too. I think when this flares up digestion slows down and the gas just backs up. It is uncomfortable no matter what the reason.

I think I jinxed myself

Because I have been burping all day and my throat is sore
my burping started after breakfast

so hard to figure this out

I will consider Gas X

I have burping mostly during flare ups. As Sara mentioned, it happens when digestion slows down. The food just sits in my stomach for hours, and it feels like I swallowed a rock. I get very little pain from my gastritis. Mostly I have a very uncomfortable feeling in my stomach, nausea and dizziness.

Try Source Naturals Digestive Enzymes. If your esophagus burns, then you need to suppress stomach acid before any healing will take place.

And of course use PepZin GI.

Yes burping is a big problem for me & worsens when having a flare up. Inflammation around the gastro-duodenal junction or gall bladder duct can cause burping. Also other gastric conditions like ulcers, hernia or gallbladder conditions cause burping.

I was quite surprised to read about drinking pomegranate juice - that would destroy me! I can't drink any fruit juices - too acidic.
Also I once attempted to drink a carbonated drink - soda water I think. I thought I was going to die from the burping & pressure it caused!

I also have that problem of food sitting in my stomach & trapped gas pockets. I do usually find that an antacid or sodium bicarbonate helps shift it though. Or I sometimes take a probiotic.

Stupid gastritis.

After reading the Aviv and Kaufman books I stopped the Cranberry juice

Burping, all day now, less stomach burn,
But a general feel of discomfort, nausea and dizziness

Stay away from all juices for awhile. THey are all very acidic, if not naturally,then added in the preservatives. Try coconut water, that is soothing. The drinks are very hard to manage. There is not much that is good for gastritis. In the beginning I drank water only and that would even hurt at times.

Filtered water can be acidic as they have so many ions removed. I used to get burning with filtered water. Tap or Mineral waters are generally ok. Don't be afraid to buy a pack of litmus papers & test the acidity (pH) of drinks yourself!