@Joinmelb
Sorry to read your frustration with NDIS. I have a sister on NDIS and we met all the criteria, it was not Cancer related. She is unable to work or look after herself hence NDIS and Disability Support pension are accessible for us.
I just googled for you and found this
Cancer patients do not qualify for NDIS because of cancer alone. If impairment results from cancer or treatment, they may satisfy the NDIS access requirements. For NDIS eligibility, cancer must cause permanent impairment that results in the patient being significantly disabled.11 May 2022
Consideration of lymphoedema as a disability meeting the specific NDIS requirements will need to occur on a case by case basis. Many individuals may live with and manage lymphoedema as a chronic condition without meeting the disability requirements.
Hope that helps! Basically it seems that you need to have an impairment to qualify.
I hope you have someone that can help navigate the NDIS
Best wishes