Thanks for writing to us.
In all probabality ,the pain that you are describing could be due to a minor lesion in the Gastro oesophageal junction.As the liquid crosses the ulcerated area in the region the exposed nerve
endings get stimulated and you get pain.
The right investigation for you is Upper GE Endoscopy
and consult a Gastro enterologist.
Till then pls refrain from oily/spicy food/smoking/drinking ie., hurry/worry and curry. Have Antacids/ Proton Pump
inhibitors/Spasmolytics/Probiotics.Have a propped up position in bed to prevent gastro esophageal reflux which would aggravate the symptom.
In addition if you have any suspicion / your fears about any Cardiac causes kindly go for an ECG also and get it reported. In all probabality it is not due to any Cardiac causes at all.
Wishing a speedy recovery.,
Dr Lt Cdr ASN Bhushan,