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how old is he?
he could have a viral infection or stomach flu or food poisoning or viral infection possibly
any fever? is he able to drink fluids and keep them down?
under arm temps are not very reliable.
I would do a rectal or oral temp for him.
he sounds like he is quite dehydrated if he is dizzy and can't keep fluids down
he should go to the ER and get some IV fluids and hydration and prescription antinausea medications