Wish I knew the answer too. It's even more frustrating knowing what you're capable of achieving if you could just. get. going.
Sometimes I sit still for hours just zoned out with mental exhaustion. My spirit feels suffocated and crushed and I have no energy, I can't bear to think. I just want to close my eyes and drift into unconsciousness. Then my partner comes home all normal and I have to "keep up" appearances so as not to burden him with my lost vague hopeless nothingness. There are many things I can do, should do, might do in a day, a week, a month a year, but don't.
Often this seems to manifest in what appears to be procrastination to an outsider. As I only get something done at the last minute and only when people are depending on me in some way. It's like I want to want things in life but it all seems so hard, such a massive hill to climb and so meaningless. The world around me is too loud and it makes my senses cringe. My heart feels so heavy and fragile and old and tired of life.
Occasional functioning usually involves a great deal of self talk and berating, to the point I can't stand myself as I am. Then I have a shower, eat something, and pat myself on the back with a hollow inner voice. Most things I do are rather mindless... Basically I struggle to care about anything beyond the point of acting a part to appear normal to people I come into contact with.
That's how I survive. It's not really coping. And certainly not living.