I have been in exactly this situation. It got to the point that it was only the fact that I was retraining to do something else that got me through the day.
It is all about controlling your thoughts and emotions.
Do you think the Castleton lead miners, got much out of their working lives?
They only got Sunday mornings off, and that was to go to Church, and they were dead by the time the were 50 (if they were lucky)
The fact of life is, we all have to put food on the table, if you are fulfilled by your job then great, I have met lads that are working themselves to death to pay the bills.
Boredom suddenly doesn't look so bad does it?