Hi Helene,
Yes, I got much worse and crashed in a major way as a result of my KDM treatment.
BUT
He diagnosed fructose malabsorption, which changed my life. When I went to him I had such severe diarrhoea I was close to being bowel incontinent and eliminating fructose got that fully under control. The first two sessions of antibiotics also got my intestinal inflammation much improved. It was all the other symptoms that got worse.
So yes, If you have terrible guts, I do think it is very likely he can really help you. He does a food allergy panel which is also great, not every food was correct but it seems to be the best one existing and it was also a great help to me.
The area I am not so convinced about it the detailed poop testing. He gets all your bacteria analysed and prescribes probiotics based on what you are lacking. It seemed so impressive at the time!!! BUT it is terribly haphazard and in reality, what actually makes the difference is taking tons of probiotics, any kind at all. The "ideal balance" of bacteria is different in every person, and an unknown area of science and so I think spending hundreds of pounds to find out what you've got in your gut is not really worth the money.
I eventually figured out that nexavir was a major contrinutor to my crash because it contins a huge amount of phenol, to which I have an extreme intolerance. I had told KDM about my chemical intolerances and specifically mention phenols, but he doesn't take proper notes during appointments so he presumably forgot that. When I mentioned it to him afterwards, he clearly was not interested.
I didn't try GcMaf so I cannot make any comment on that. What I can say is that we are all different, and his treatments do work for some, as we've already seen, in some cases fantastically.
The other good reason to go to him is that his initial workup is very informative, I found out a huge amount of detail about the state of my immune system and various infections I had, my abnormal cortisol level, metal poisoning etc.
The one weak point is the testing for chronic infections like Lyme disease, chlamydia pneumonia and others which can cause pretty much all the symptoms of CFS. He uses an ordinary lab n Belgium for this which is not sensitive enough - when I was re-tested in Germany by a more specialised lab these tests came up strongly positive (plus others). However, my detailed immune profiling tests ordered by KDM (at Redlabs) were what led me to this, as everything pointed to me having tertiary Lyme disease. So ultimately, my KDM experience was an essential stepping stone in the long journey that led me to discovering all the infections I have and getting the current treatment which really seems to be helping.