For general upset or distress:
* געשווינדיק (geshvindick): This literally means "hurried" but can also convey a feeling of being agitated or troubled.
* באַדאַכט (badacht): This means "worried" or "anxious."
* פֿאַרשטעלט (fershtelt): This means "confused" or "disoriented," which can also imply upset.
* צאָרג (tsorg): This means "worry" or "concern."
For anger or frustration:
* פֿאַרבייזיקט (farbaysickt): This means "irritated" or "annoyed."
* בייז (bayz): This means "angry."
* צוריקגעשטויסן (tsurikgeshtoisen): This means "repelled" or "disgusted," which can also indicate anger.
For sadness or disappointment:
* טרויעריק (troyerik): This means "sad."
* פֿאַרלוירן (ferloiren): This means "lost" or "disappointed."
* געשטויסן (geshtoisen): This means "shocked" or "dismayed."
Ultimately, the best Yiddish word for "upset" will depend on the specific nuances of the situation and the feeling you want to express.