You are probably having acid reflux due to lax lower esophageal sphincter, you need to get yourself examined by a surgical gastroenterologist. You need to be on antacids and anti reflux meds.
You may also need an usg abdomen followed by upper GI endoscopy.
Next Steps
Visit a surgical gastroenterologist
Health Tips
You need to get an ecg done to rule out cardiac problems which can masquerade as gastritis symptoms.
Avoid spicy foods and don’t lie down for 1hr after meals