Hello, Tabanee, Thanks for visiting this site.
Formation gastric juice in your stomach in excess amount.
Gastric juice i.e. gastritis
( hyper acidity) . In this type of situation these is burning sensation in stomach as you have said.
Reasons are many but few are as , excessive food, fried spiced food, anxiety
, spirit( alcohol), antibiotics etc.
If gastritis is there patient feels loss of appetite , burning sensation.
Most commonly prescribed drug for this is antacids .
Now a days many medicines are available for this disease , one of them is rebamipide
but this drug should be taken under the supervision of a doctor.
Good luck , I hope you will recover within short period.