This may sound odd, but.... I've found sometimes we just really need to acknowledge those feelings, do what other people might call wallowing in them, but is really just giving ourselves a rest from an exhausting struggle of trying to muster up energy for optimism or over-achievement. A lack of desire is usually transitory, and if you accept it, you will get to the next stage in time. It's okay to be worn out. I used to be so afraid I would break if I admitted to that, that if I got stuck in that place, I'd NEVER make it out, but I absolutely have, more than once.

Can you wait it out safely, or are you suicidal?