When seeking professional advice on work after cancer, a useful starting point is one’s general practitioner who, in consultation with the oncologist, can either address issues or make an appropriate referral.
For listing of occupational physicians see https://www.racp.edu.au/about/racps-structure/australasian-faculty-of-occupational-and-environmental-medicine/find-a-consultant
For listing of occupational therapists see https://www.otaus.com.au/find-an-occupational-therapist