RTÉ One's brand-new documentary, My Broken Brain, follows Irish people who have been diagnosed with neurological disorders ranging from Epilepsy and Motor Neurone Disease to Alzheimers and Parkinsons.

It would be easy to think that these issues are a rare occurrence however more than 700,000 people in this country suffer from some form of a neurological condition.  

Billy and his son
Billy Reilly and his son, Billy Junior 

Throughout the documentary, we will meet a number of contributors including 47-year-old Billy Reilly, originally from Naul, who was diagnosed with Motor Neurone Disease - a degenerative disease for which there is no cure - in 2015.

Once deeply involved in GAA, Billy is now in a wheelchair with little use of his legs. Tonight, as he takes part in a clinical trial under Professor Orla Hardiman, we will discover whether or not the results have been successful.

Billy, his wife Sharon and their three children - Lauren, Rebecca and Billy - are also learning to live with their new reality. In the video above, the couple reflects on the moment that he was diagnosed with MND.

Billy says: "I can remember Sharon saying 'okay, what can we do to sort this?' and I remember myself saying 'no, this is a death sentence'. I knew.

"The word Motor Neurone didn't shock me. This might sound weird - it wasn't that it was a relief that he said Motor Neurone but it was more a relief that 'I am not going mad, I am not imagining this, there is something happening in my body'."

Ronan Smith
Former actor and theatre producer Ronan Smith

As well as Billy, we'll also be meeting former actor and theatre producer Ronan Smith from Blessington, Co. Wicklow who is living with Familial Alzheimer’s Disease; Brian Byrne from Swords who has very severe intractable epilepsy; Cynthia Gardner and Gary Boyle, both of whom have an early onset of Parkinson’s Disease. 

Watch My Broken Brain on RTÉ One, Tuesday, July 17th at 9.35pm