I find it helps to tell myself: concentrate on the next step. Look no further ahead than that.

Long term vision is nice to have, but you can do only one thing at a time. Do that. When you've finished, there will be time to think about what comes after.

Also, put your health first. Never skip a meal. Make a regular time for exercise, and make it a priority. When you clock off, stop working.

Charlie Brown talks about dreading only one day at a time. It sounds like a joke, but actually it is very good advice!