Sorry to hear about your recent incidents whilst away....have you been to see your Doctor and see what he/she thinks and advises?
I would think they would probably give you a complete blood test to check for EVERYTHING to make sure you are tip top or if anything shows up in the tests and take it from there. Crisps and cherries probably didnt help if you were feeling a bit sick.......small sips of water would have been better.
My suggestion and advice would be to go and make an appointment with your GP, D.O.C ( if you see what i mean ) and best of luck :0)