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You seem to have had a hypoglycemic episode. When your sugar goes down you get these symptoms. Flucloxacillin can cause gastritis
and increased hunger. If you are a diabetic and on insulin
you should decrease the insulin dose. Corn
flakes release sugar slowly and therefore not the ideal food to take during hypoglycemic attack. Orange juice is alright.
Eat well when you are on flucloxacillin, you can continue and finish the course by taking it for another day.
Hope this helped