Thanks for your question on Health Care Magic
I can understand your concern.
By your history and description, possibility of
gastritis is more.
But better to get done ecg to rule out heart diseases because left sided
chest discomfort is common in heart diseases.
If ecg is normal then no need to worry much for this.
Possibility of gastritis and
hyperacidity is more. Your pain is subsided by water intake. Water dilutes the acid in the stomach and hence subside the pain.
So drink plenty of fluids orally and keep yourself hydrated.
Start
proton pump inhibitors.
Avoid hot and spicy food. Avoid junk food. Avoid
stress and tension.
Don't worry, you will be alright.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.