Patricia Chell and her husband John, from Shropshire, say she owes her life to the work of Dr Sarah Myhill.
She is due to go before the General Medical Council for the seventh time later but says she cannot understand why complaints against her are being heard.
Dr Myhill has a private practice near Knighton, Powys, where she specialises in treating patients with chronic fatigue syndrome.
She says she tries to find the causes of a disease, rather than treating the symptoms with drugs.
A GMC panel will consider whether her methods pose a risk to the public.
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