As a former long term patient of Dr Myhill I would like to wade in to the discussion with my thoughts
Firstly, in person she is a VERY compassionate, kind and sincere Dr. She takes a lot of time in face to face appointments and she is on the hunt for clues and is open minded - she is the only Dr to have heard of my history of post-partum haemorrhage and suggested a degree of Sheehan's syndrome in my case. The same with subclinical hypothyroidism. She is happy to prescribe drugs if there is evidence for their use, but wasn't gung ho with them.
She prescribed me B12 injections and they were not expensive and they did help me at the time, but the effect eventually wore off.
Testing: She has a lot of testing available through her website that you can order if you like, or she will suggest it. The mito testing was a breakthrough for me as it showed me, friends and family that I wasn't mentally ill, but really physically ill. Further testing backed this up (translocator protein studies) However, years on I now see that all the tests are doing is showing you that you are ill - they are not really that specific, and I did already know I was very ill. The trasnlocator studies were not useful in terms of treatment.
All of her treatment suggestions for mito functioning, SIBO etc are on her website so you could conceivably just follow that and do without the testing or appointments.
Treatment: she prescribed me a LOT of supplements - mainly ones I had shown, on testing to be deficient in - carnitine, manganese, selenium etc. Most of the supplements I couldn't tolerate, we now know I have MCAS so this is no surprise. I was never able to add in all her supplements.
Diet: she is VERY dogmatic about the diet and sleeping hours etc. She actually follows them herself and I have never seen anyone so glowing, energetic and healthy. She treats a lot of people with fatigue, not just M.E/CFS and I think they are helped a lot by her interventions. I found the diet impossible at that time and couldn't stick to it.
The issue I had was hat if you don't do the diet and the supplement and go to bed at 9 and rise at 6 am then anything you tell her she will say is because you haven't got these bits 'in place' yet and nothing else will work until you do. This approach upset me as I was doing my best, so decided to move on and went to see KDM.
She has in recent years begun testing and treating Lyme and co, which is a good thing. She also took over Dr Skinners thyroid patients when he died a few years ago ( I had seen him also) - she is extremely dedicated to helping patients of all kinds.
She has helped me a lot with benefits etc by writing letters supporting my condition for the DWP etc - of course I do [pay for these, but they are beyond helpful to me and most Drs wont do this.
For me a mixed experience. I know many who have been helped by her a lot. I have not been, but as she herself would point out I didn't follow the protocol to the letter. She is rather too dogmatic about her diet etc, but is warm, kind and dedicated.
For anyone who thinks she is an embarrassment, or hokum etc I would like to point out, Dr Myhill is a trained GP - a real Dr, but specialises in environmental medicine - so she treats the whole person - diet, environment etc with lifestyle advice, supplements and drugs and she has never hidden this aspect of her practice. It is who she is and what she does.