Help approaching my boss for leave at half pay
Cross posting from AUSCORP - there might be more understanding of ADHD and RSD in here.
A bit of a complex situation. I've been through an investigation at work. I am still employed, the other person resigned (it was a resign-or-we'll fire you kind of situation). The investigation was drawn out over multiple years, and I'm thoroughly exhausted. I have mental health challenges (anxiety, depression) and I've just been diagnosed with ADHD (with rejection sensitivity). The rejection sensitivity makes this all makes sense - I am hyper sensitive to rejection and experience it as trauma, which is what was my perception of what was happening at work.
This is all very embarassing as I'm a highly paid manager and working professional. I want to take 12 months off to work on my mental health, get some therapy, develop some better coping skills. I can afford this without too much struggle.
I have enough leave (annual leave, long service leave) to take leave at half pay for all of 26/27. My boss isn't obliged to approve that leave. I'm not covered by an EBA, and I am paid above the upper threshold for FWC unfair dismissal.
How can I approach this? My boss knows I have mental health concerns, and is generally supportive, but that doesn't mean he will approve this kind of leave. Would getting a sick leave certificate help me out?
I don't want to go down the work cover path, as the investigation isn't worth the additional strain on my mental health. I also don't want to approach this the wrong way and get managed out. Likewise, I can't keep going the direction I was going, as I'm in survival mode.