His eyes tear throughout the day & sweat forms on his forehead, usually when he is eating. the weather isn't hot. his breath is acid smelling.

He may have a fever : I can't be sure. We may have a fever or infection. Certainly you could have him see your physician and see if there's anything that might clarify what his symptoms are due to

MULTIPLE ISSUES: He needs an exam and lab work. GERD can cause acidic breath especially need screen for H pylori blood and stool. Eye tearing may be allergic or infectious conjunctivitis, if there is eye discharge more likely infectious. Excessive sweating mandates a thyroid evaluation