If you are upset, you are distraught. If you don't want to explain why you are pulling your hair out, just utter "Leave me alone; I'm distraught." It'll work.

While distraught may sound like an old Germanic past participle, it is actually an alteration of distract from the Latin distrahere "to draw in different directions." If you are distraught, you are so upset that it's hard to think straight, hence your mind is "drawn in different directions."

Definitions of distraught
  1. adjective
    deeply agitated especially from emotion
    distraught with grief”
    synonyms: overwrought
    troubled emotionally and usually deeply
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