Heike, that sounds absolutely awful. It's bad enough for healthy people going through this treatment let alone those who have other medical problems. Have you been referred to a social worker? Such a person should be able to give you access to all sorts of assistance. The same with the Cancer Society. I was surprised and pleased to hear the other day that they will provide frozen meals if I want them. This is just an example of help that is out there of which I was previously ignorant.
I don't know how the Australian medical system works but assume it is not too dissimilar to New Zealand's. When my husband was diagnosed with dementia and I was struggling to cope I had excellent help from a social worker and occupational therapist.
I wish you well in the weeks to come.

Maureen