I've also worked with multiple people with various mental health conditions, who weren't actors, but whom were extremely good at their jobs and I'd cheerfully hire again.
Honestly, I've never seen a correlation between "mental health issues" and "would not hire".
No, the ones who are so much of a mess that they cause major problems are the unusual exceptions.
Many, many people have mental issues that they manage to control (through a variety of resources). It's a spectrum, from those people who are slightly, and occasionally, inconvenienced, to those who really aren't able to work well.
Tarring all of those people with the same brush really doesn't help anyone, including yourself.
Also, it is possible that acting is a profession unusually accessible to people with certain mental illnesses.