Thanks for coming to HCM
Burning pain sensation while taking meal can be a sign of peptic ulcer
and the pathophysiology is food leads to acid secretion which causes the symptom. Oral ulcers can also be the Manifestaion of reflux.
I advise you to go for upper GI endoscopy
or barium meal
to rule out the same....If ulcers are diagnosed you will be off symptoms by taking proton pump
inhibitors like omeprazole
for 2-3 weeks.
for oral ulcers you can apply boroglycerine oral preparation to avoid ulcer sticking which helps their healing....B complex preparation will also help.
Since the pain is on left side involving the arm it will be better to go for ECG to rule out cardiac disease....