Why does relaxation trigger floods of work problems and anxiety?

I can manage my work anxiety all day, but as soon as I try to relax and close my eyes, every single deadline and problem from the office floods my mind. The relaxation is completely ruined by this massive spike in stress. My name is Arjun, and I was born in Bangalore on 5th July 1987. Time: 9:10 PM. I need to understand why my mind uses quiet time as a trigger for professional worry.