Welcome to HealthcareMagic. It looks like gastritis
. Elevation of the upper body at night is recommended as this decreases reflux of acid from the stomach. Diet modification is essential - avoid the substances like chocolates that increase your symptoms.
You could take some over the counter antacids - approximately one hour after meals or just before the symptoms of reflux begin after a meal. You need to talk to your doctor about proton pump
inhibitors and other prescription medications for GERD
Hope it helps you. Regards.