Sorry your feeling shit! Taking time out and recognising when you need is hopefully going to help you get through this period.

Disclosure in the workplace is an individual decision. Maybe assess the pros and cons. For example.....

Pro - reasonable adjustments, might provide insight into how you've been in the workplace. And it's an opportunity to educate others about mental health.

Cons - people might impose adjustments that don't work for you, stigma, management that lack mental health literacy.

If you do decide to disclose your employer cannot legally discriminate against you. And you choose who will be told, or people risk breaching privacy under the Act.