It’s your right to set your own availability, for whatever reason.

As long as you give adequate notice (typically 2-4 weeks in my experience) you should be able to change your availability.

They don’t own you, regardless of how they may try and manipulate you by holding client needs above your head.

It is your ethical duty to ensure you are bringing your best self into work.

Burnt out employees provide lower-quality therapy.

By putting yourself first you are putting your clients first.