I'm Dr Chaithanya attending yu today.
Shortness of breath during walking is a typical symptom of heart disease, you are also saying about chest discomfort, so I do not want you to take a chance. Though gastritis can cause similar symptoms. Shortness of breath is not present in gastritis.
I want you to go to ER and get a ECG done immediately, nd be seen by a doctor to rule out Angina.
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