Drugs used to treat gastric pain?

By the symptom you describe, in my opinion you need to see a Gastroentorologist asap.
I believe you may have a stomach ulcer as one of the most common symptoms is burning in the abdomen, also, other symptoms are heart burn, indigestion , etc..

Here is a list of medications (most are RX) with user reviews:

https://www.drugs.com/condition/gastric-ulcer.html

As I mentioned you really need to see a specialist in order to get the proper diagnosis and treatment, I am not a medical professsional, I have been a member of this site for 11 years and one learns after some time about medicine, again I do not pretend to be a DR. at all.