Gastroesophageal reflux disease (GERD) with possible functional dyspepsia..
Upper GI endoscopy
Chest X-ray
ECG
Basic blood work including
liver function tests
H. pylori testing needed for further evaluation
Eat smaller, frequent meals
Stay upright for 2-3 hours after meals
Regular mild exercise like walking
Avoid long bus journeys without breaks
Stay well hydrated with plain water
Your chest pain pattern suggests a possible gastrointestinal origin, but cardiac causes should be ruled out for complete assurance