Welcome to HCM,
As you didn't have food for longer time , you could be having gastritis
which could have caused these symptoms, or it could be because of any infections.
I advise you to take antacids, which are available over the counter.Take electrolyte powder to prevent dehydration
, take bland diet for few days.
If the symptoms doesn't subside in a day or two then consult your doctor and discuss regarding antibiotics.