Thanks for your question.
You are probably a case of peptic ulcer disease
,that i can comment if i can see your upper GI endoscopy report if it at all been done.But you have been well with panta that proves that you have peptic ulcer disease or gastritis
Now i think again you have a relapse of disease or may be some tumor or mass can arises in stomach which is the dreadful complication of long term peptic ulcer disease.
Two more thing to tell that nowadays most of the peptic ulcer are due to a bacteria called H Pylori and it need a antibiotics regime to cure but if it overlooked then there may be ulcer recurrence as the bacteria could not be killed and the second one is i don't know your age but if you are more than 50 yrs then always think for any cardiac cause as you have respiratory distress
So my suggestion is to do a Upper GI endoscopy and if needed guided biopsy,USG upper abdomen,ECG,Lipid profile
,chest xray,routine blood count and with the report consult a gastroenterologist
Dr Sourav Ganguly