I went for a walk without my phone once and lasted about ten minutes before the anxiety drove me home. I'm always half-braced for the message that needs me right now. Because I can never fully be out of reach, I'm never fully off, and never actually recovering.
More people experience this than they realize.
You can't be out of contact even briefly without anxiety, so you never truly switch off.
If this sounds familiar, the Library can help you find the bigger picture.