At one time I could never understand this.
I have had the after-effects of a stroke for 2 years now and these last few days I have had a nasty stomach bug. Right now I feel truly "shite". I really ought to go back to bed.
Although I am sure I'll soon feel quite a lot better, I can understand how some people, when their bodies are old and exhausted, just "throw in the towel" and say they have had enough of life. Some patients with very high pain levels must feel like this. This is sad, but now I understand.
No doubt tomorrow I shall feel much better. Onwards and upwards. There is still a lot of living to enjoy in me yet!