((((((((((((((((((((((((leacon)))))))))))))))))))))))))))
I'm so sorry you've crashed! It's horrible when you go from feeling good to feeling rotten -- it makes the downswing REALLY hurt.
Can you do something to distract yourself? Maybe do something kind for yourself, like take a hot shower/bath, eat a favourite food, listen to music, read a book or watch a movie (NOTHING SAD!!!!) It's good to try and fight your way out of the hole -- even if you can't get all the way out, maybe try poking your head out just so you can see a little light.
Sending lots of hugs. Take care.