How do you let something that is bothering you go?

I'm wrestling with something and feeling disrespected and had an exchange with someone that sucked. I complained about it but won't hear anything (that really addresses it) back till Monday.

I'm glad I complained. I felt heard. But it is stressful nonetheless and I keep on and off thinking about how upset this makes me.

I will meditate, and distract myself with activities. I find that my thoughts and feelings about it go up and down.

How do you let something go?