I know I shouldn't be friends with my boss and shouldn't follow them on social media but I do. We're very close and I know a lot about them, including their mental health issues. But... alas here we are

They are currently in the middle of a manic episode. Haven't eaten or slept in days, paranoid, delusions of granduer, it's gotten to the point that they want to quit their job to start some sort of revolutionary brand and want ME to follow suit. They are making me create documents during work time outlining their idea for me and them to quit. 

1) I never said that I wanted to quit. I am stalling as much as I can on these documents but I can't do that forever
2) I know they actively need urgent help like.. NOW. But Idk how to handle this with our superiors. They need fmla time but I don't want to "out" them at work? It's not my place to out his mental health status. It needs to come from them but they're not in a state they can do that. 
3) they said themselves they are having a mental breakdown and need help. I have that evidence saved on my phone. Am I out of line to use that at work? I don't want to use it against them I was thinking it might be useful to help them get the time off they need?

Idk what to do and how to help a friend without compromising my standing at work