Sorry to hear that.
Erythematous mucosa is a sign of inflammation.
H pylori infection can cause this.
if present then you will require triple antibiotic therapy.
Another possibility can be eosinophilic gastritis due to the excessive eosinophil infiltration.
This is possible with certain food allergies.
A restricted diet is preferred.
High dose steroid like prednisone is considered as initial treatment to control the symptoms.
The erythematous area should be been biopsied.
You should consider following low fermentable sugar diet ( FODMAP diet) to reduce your symptoms.
Please go to this link for detailed information:
Also take a probiotic ( lactobacilli, bifidobacterium) daily.
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