Peter Rees, who claims he was sent home from Glangwili's accident and emergency unit in the early hours of New Year's Day without being offered any help to get home, said he was in danger whilst trying to walk home.
I was literally clinging on to bramble bushes as I edged along the hedgerow in the face of oncoming traffic. I was shattered, freezing, I felt giddy and I lost my footing more than once.
Mr Rees had been at home in the village of Llanwrda, near Llandeilo, on New Year's Eve when he was hit by a bout of uncontrollable coughing and shortness of breath. He was examined by a paramedic at home, who called for an ambulance to admit him to hospital.
After X-rays, blood tests and an examination Mr Rees was told he could go home.
He said he walked 10 miles before encountering a police officer who urged him not to walk any further because it was "too dangerous".
More top news
Eurostar passengers were left stranded last night after migrants reportedly climbed on top of trains at Calais.
Andy Burnham is set to criticise those who question membership of international alliances and institutions in favour of 'isolationism'.
Wrestling legend Jimmy Snuka has been charged over the death of his girlfriend more than 30 years ago.