Back to Manuka - apparently a lot of stuff on the supermarket shelves is not pure manuka so beware. You'd want the medical grade. However, honey has been used for it's anti-bacterial properties for centuries. I remember a poultice my Mum used to use which was sugar and soap to draw out deep splinters and thorns but I'm getting off-topic.
@shann I don't want to bombard you with suggestions (especially ones that you may already have investigated) but have you thought of contacting the big overseas cancer centres. Almost certainly, with the larger populations, they will have seen something like you are going through and may be able to help. I had a friend, many years ago, with a different type of cancer - they could not even work out what was wrong with her here until a junior doctor joined some dots and, to cut a long story short, never seen in Oz but a handful of cases in US. I know this is a completely different scenario but if your doctor is not willing to help, it may be worth exploring.