Gastritis Support Group
Gastritis is a medical term for inflammation of the lining of the stomach. It means that white blood cells move into the wall of the stomach as a response to some type of injury. Gastritis has many underlying causes, from infection with the bacterium H. pylori, bile reflux, or excessive consumption of alcohol or certain foods or drugs like aspirin.

In the interim, take a multi and eat the best you can. But, I think looking into it is a fair thing to do. If nothing else, peace of mind is a good thing to have about your nutritional levels.
But, I did fine with Boost and it helped me keep my weight up when I was struggling.
Keep us posted with the results.
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Cas