Mother describes son's anguish with ME
Diana Newcombe's 20-year-old son Oliver went from being a fit and active student to becoming bed-bound and unable to speak after having the flu in 2009.
Myalgic encephalomyelitis (ME), also known as Chronic Fatigue Syndrome (CFS), is characterised by prolonged fatigue associated with symptoms such as muscle pain, headaches and sore joints.
The NHS watchdog NICE has produced guidelines on how to treat it, but some argue that it often still goes undetected.
Speaking to the BBC, Mrs Newcombe says Oliver was initially told he had depression.