Yes.
mad
Yes
Upset can be either an antonym or a synonym. Flustered would be a synonym. Calm would be an antonym. Since upset can be a noun, verb or an adjective, There could three answers for each!
illness, sickness, disease, complaint, disorder
Synonyms for complaint include protest, objection, grievance, charge, grumble, criticism, moan, lament, grouse, or gripe. Medically, the word complaint refers to a symptom (as reported by a patient).
Because of its modern usage as a complaint, the synonym would be criticism.
agitation, apprehension, hassle, panic, upset, bewilderment
Strife is a synonym for fight or argument.
upset, worried, troubled, distracted, tormented, distraught, agitated, wretched
trouble. agitate. commove. interrupt. touch. upset. vex.
unhappy; upset; bleak; pessimistic; harsh; severe; dour; dismal; gloomy
Tremble, quiver, shudder, agitate, rattle, upset, distress, undermine, weaken...