When you are very uncertain how what you're writing is going to be received, but know it must be done, and you're typing with one eye closed, squinting, like you're at that part of a movie that you know is going to be an utter disaster to witness, but you have to watch it, you -have- to, and oh god, you hit enter-
-and it's great. Better than great. Received, returned, and you go to the next pose. At the end of it? You've got a story and a log that makes you stare up at the ceiling for a while, but not one you can reread for a bit. Because holy hell, the things you wrote and your character did/said/shouted/accused/etc.
ETA: This has been the experience for over a month. I know stuff happens in waves, waxing, waning, etc., and right now I'm just really happy with my writing and all the writing I've done with the most amazing RPers. YOU KNOW WHO YOU ARE. You guys. You guys are so great.