End of 457, have to leave Australia

Matbe this is a case for not letting folks who have "mental health issues" into the country in the first place, like they won't accept a family with an autistic kid as an immigrant, at least not through the usual channels. Maybe. Anyhow, I've been here nearly 4 years, holding down a professional position and paying my taxes. Not that it all went smoothly, mind you, these have been the most stressful years ever - being bipolar and having the possibility constantly of losing the job if one ever slacked because of going down, and losing the right to stay if I lost the job.. well, that is a stress no one wants to face! It's finally happened - you know, the "whatever you focus on" thing - well, I've been paranoid about what would happen when time was up for so long now, and now it's happened. My parents are Australian citizens , one of two sisters is a citizen, and I have to leave. Why can't I stay? I'm over 50. It never occurred to me to attempt immigration begore because quite frankly, lots of paperwork freaks me out. But now I got a job because what I know is rare. Not rare enough to have paid me enough to be able to stay because I earned the Fair Work High Threshold. Nope I must go because all visa options fall away when you turn 50. Why am I writing this? Well, I feel that someone ought to know. Much is made of mental health care here. Australian citizens don't know how good they have it. I, like Snuffles, have no support and no carer, but unlike Snuffles, I also have no country, nowhere to go, no one I know in any of the countries "out there", but I can't stay here, amongst the people I've grown to know. Yes, maybe you should keep them out altogether, because it's really difficult when they've been here and then, mental health or not, they have to go.