Dr Myhill worked with the NHS for 20 years before entering into private practice. She was the Honorary Secretary for the British Society for Allergy and Nutritional Medicine for 17 years, and has worked with over 5,000 patients with fatigue.

She is author of the books Diagnosis and Treatment of CFS and ME: it's mitochondria not hypochondria, Prevent and Cure Diabetes and Sustainable Medicine. She is also the author, with colleagues, of three scientific studies in the International Journal of Clinical and Experimental Medicine showing that the level of mitochondrial dysfunction correlates with the degree of fatigue.