Ideally I'd like to live in a world where the most important thing would be a person's health and well being. Hope that this will come in the future, it used to be something I wanted to strive/ fight for, but now I have no energy to fight anymore.

Still, somewhere deep inside I believe this should be right, to be able to get up and respect your needs and get away from work when you don't feel well.

But I'd be a hypocrite if I said I'd done that. What I did was to wait until I couldn't do almost anything for a few weeks, and then at the end I went to the doctor and told her, so now I'm on sick leave. Not something I recommend though, to wait that much.

Probably it depends on many factors, but ideally we should be able to leave when we feel sick.