The thing that keeps me going through such such times is my plans for the future. If you create a plan for something - no matter if it is even a year or so away - (I am currently planning my trip to the UK next year!). This helps to give perspective to the stuff I have always called "monkeywork" - repetitive stuff which requires little or no brainpower to accomplish. While I am doing that crap, I can be thinking about the details of my plan.

What's your plan? That's a rhetorical question - no answer required.