I know that I'm being crazy, but this sounds like what's happening to me. My sleep has been shit, I've become very suicidal and started self-mutilating, and my anxiety and stress have become uncontrollable. I know it seems silly, but this seems like it could be the case.
This is exactly what it is. Your body is essentially regulating itself like you've gone through extreme physical trauma and certain processes are shutting off/prioritizing themselves lower than normal. It's probably not devoting as much protein to the hair growth cycle as a result. On average, a healthy adult loses a fair amount of hair every day. If your body isn't up to date on the growth cycle, then what you're seeing is the stuff you're losing without any of the new growth coming up to replace it.
Speaking as someone whose body went into absolute overdrive and lost a fair amount of hair because of constant stress, you need to get your stress and anxiety under control if you want it to get better.