Before retiring he had farmed near Bridgnorth, Shropshire, for 46 years, but he now lives in Herefordshire.
Humphreys said the next thing he remembered was being taken to hopsital and told he was going to be put to sleep.
“Waking up nearly six weeks later, not knowing where I was, not being able to speak, not being able to move, was a hell of a shock.”
The mental health problems hit hard when he finally got home, he said, adding: “It sort of started with hallucinations and I got into a very dark, dark place.”