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Charlie;
Best way I find to get out of it is to distract myself with mundane things. Of course it's getting out of a rut that is the hardest part, but once you go force yourself up to go to work, or paint a fence, or clean a driveway - it's the best. Not fun but a distraction from it.
That's all you can do. The only other option is suicide which, contrary to what people always say about "suicide is not an option!" it really is. I don't understand how people are angry at people who have committed suicide, or how they can say it's selfish or whatever. Often it perhaps it the best option, which the person has obviously weighted the positives and negatives up to reach that conclusion.