Sorry - Sometimes my brain fog gets the best of my reading comprehension skills - I must have completely skipped over the part where you said you had already tried glutathione and NAC.
At this point my only recommendation would be to find a doctor that is willing to administer the nutritional IVs or Myers Cocktail (about the only cocktail you can have with CFS/Fibro - haha). I was getting them twice a week for 2 or 3 weeks. Now that I have stablized, I get them every other week.
I would try to help you find someone that does them but I don't know where you live in Australia.