Hi welcome to Health care magic forum.
Thanks for calling H.C.M.F.
It appears that he had a fever of intestinal origin, probably enteric fever
. That is why he had stomach pain followed by fever. It also will have sneezing
as well, which in turn will have upper respiratory tract
like symptoms and nose bleed etc.
I advise you to consult a pediatritian for diagnosis and treatment.He may have to undergo series of blood Tests for confirmation.
Wishing for a quick recovery.