About the fungal stuff, I'm reminded the common saying (around MS circles at least), that "everybody's MS is different". I'm not sure who much I agree with that, given that we now have solid evidence of a link with EB virus, but it might be that along the chain of factors some people have "fungal infection", others "parasites" (as I've recently heard), etc.
Could you say how long it's been since he moved and where? Several people here are talking about the important of sunlight, and I know that to be true for me, I always feel much better with sun - not vitamin D - sun and sunlight, and I'm seriously thinking about the possibility of a move, even though I have no clue how I would practically achieve it atm.