Are high fevers (103.5) part of hand foot mouth disease in adults? No congestion; chills and throat. I can't get to a doc, but kid was just dx'd.

Coxsackie virus. Any virus can evoke high fevers, if you want to know whats ailing you there are respiratory viral panel tests that can narrow the field.Take yourself to an urgent care center or ER to find out, may be a different cause.
Yes. it should go down within a few days if get other signs of infection ear/nose/throat or lungs or other it will come to light soon, remember a fever is the natural way the body kills infection usually i don't mind up to 102 but higher can be a sign of things brewing, or if have a headache take some aspirin and call me in the morning....