How to Say "to fret" in Spanish
The Spanish word for “to fret” is “preocuparme” — A2 level. This is a very common word in everyday Spanish.

Examples
No quiero preocuparme por cosas pequeñas.
I don't want to worry about small things.
Empecé a preocuparme cuando no contestó el teléfono.
I started to worry when he didn't answer the phone.
Es difícil no preocuparme por el futuro.
It's difficult not to be concerned about the future.
The Reflexive 'Me'
The 'me' attached to the end means 'myself.' This verb form is used when the person doing the worrying is also the person affected by the worry. This is how Spanish expresses 'to worry' generally.
Attaching the Pronoun
When you use the infinitive form (the '-ar,' '-er,' or '-ir' base form), the small pronoun (me, te, se, nos, os) must attach to the end, forming one word: 'preocupar' + 'me' = 'preocuparme'.
Placement Rule
This form ('preocuparme') is used after another conjugated verb, like 'Necesito preocuparme' (I need to worry) or 'Intenta preocuparme' (He tries to worry me).
Forgetting the Pronoun
Mistake: “No puedo preocupar.”
Correction: No puedo preocuparme. (The verb 'to worry' is almost always reflexive in Spanish, meaning it needs the pronoun.)
Separating the Pronoun
Mistake: “Me voy a preocupar.”
Correction: Voy a preocuparme. (While 'Me voy a preocupar' is also correct, attaching the pronoun to the infinitive, 'Voy a preocuparme,' is a common and natural alternative.)
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