Hello and welcome
I share your concern
looking at your description it might be related to stomach
hyperacidity or gastritis or food poisoning
I would advise you to take antiacidity medicines like
pantoprazole or
ranitidine group of drugs with antacids and antiemetic like
domperidone or ondansatron for vomiting
if it doesn't subside in a day or two than you need to see a gastroenterologist for an endoscopy if need be.
You should avoid fatty fried spicy and junk food
Have lots of fresh fruits, fruit juices and vegetables
However I will be requiring more information for better assessment of the condition like
Since how long you have this problem?
your built, height and weight?
if you oredered for blood tests or other investigation, please upload me the reports?
your relevant medical history like diabetes,
high blood pressure or any other disease
waiting for your reply
Best wishes