This seems to be food allergy , as you feel symptoms after having food .
I will suggest you to have anti histamine for 2 weeks and see response .
Tab Benadryl twice a day will be helpful .
Meanwhile avoid chocolates , fish , gluten .
Hopefully things will improve .
As far as Pancreatitis is concerned , its pain is severe and not presents with only fever .
You should also get Urine test for any infection .
Regards ***** ***** luck .
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