Ever break something as a kid? Something important?
If you did and you likely grew up in an environment driven by fear of what might happen, well first of all, fuck your parents cause that's no way to raise someone but anyway.
That instant sense of dread, those moments of trying desperately to make it better, fix it, hide it maybe. Dread and guilt.
Always dread and guilt and if you can recall what those miserable moments felt like, then you can tap into my own personal little corner of anxiety. Only there's nothing broken, I didn't do anything wrong (this time) but there it is, dread and guilt, fucking constantly. If I look tired a lot of the time, well, there you go.