A warm welcome to you Miss C
I feel for you so much as you navigate a number of systems that appear to be sabotaging your efforts to better yourself. Was saying to someone just yesterday 'I believe the most effective way to deal with any challenge involves first identifying the challenge/s involved and then either manage them or seek help from others to co-manage them. Unfortunately, when the co-manager's actions or inaction is depressing, things can become even more depressing'. I'm sure I don't have to tell you this.
I know easy for me to say but it's important you keep in mind the incredible effort you are making in raising yourself. When you realised raising yourself was something you needed help with through a psychologist, you employed one. When you realised raising yourself to the point of regaining care of your child required more effort, you put more effort in. When you realised raising yourself required help from the ndis, this is what you began wanting to work towards. Just about every step of the way, your goal has become about raising yourself. You gotta admit, that's pretty amazing for someone who struggles with mental health challenges.
So, now, you reached the point where you're angry and I can't say that I blame you. Would you say you feel like screaming 'Okay you sh***y bunch of hopeless people...do you understand how depressing you all are?! Do you not understand how incredibly overwhelming all this is for me?! All I have ever asked for is that you help me raise myself to a life I long for and you just can't deliver. Why the heck not?!!!' Basically, you've reached the point where you can no longer tolerate the intolerable behaviour of others and YOU'RE ANGRY. You face the faults of others and the systems that are obviously broken to some degree. So, the question becomes 'How do I best navigate a broken lot of systems, in order to get the results I'm after?' Now, you've got the mindset of a warrior, going into battle, which is not a bad thing if you want results.
Wondering if you or a friend who can tag along can challenge the psychologist to action. Might go a little like 'I want serious answers as to why I'm ineligible for the scheme. I want assistance that enables me to succeed in the way of my mental health, not assistance that sees me fail to get better at every turn. Now, how are we going to manage this and don't tell me 'I don't know'?' Start making demands as opposed to making requests. I imagine this will be a challenge.