@KezzaG unfortunately the rules around super and early release are strict. They are strict to protect us from ourselves and unscrupulous advisers and I have to say in 20+ years of public practice this is justified. Frustrating for you but totally justified.
There are probably two things you should consider - negotiate every bill and talk to the bank before it becomes dire and prioritise ie make mortgage payments ahead of medical bills. If your medical bills are outstanding you will met the criteria for release.
The great unknown in this this is if you will return to work. If you are out of leave would you qualify for sickness benefits? @Zoffiel suggestion of a Centrelink financial counsellor/ social worker is very valid and a great place to start. A Centrelink benefit could bring a healthcare card and the discounts that brings are invaluable.