So here is the lesson I learned this week:
If you stop taking Cymbalta for several weeks, then start taking it again, it will screw up your ability to sleep or focus for several days. It's been the weirdest thing, and I haven't been able to write at all.
I think it's settling down now though. I've been able to get a little work done, and I slept better last night than the previous two. So by the end of the week hopefully I'll be back to normal.
I'm not sure if it was a convenient or inconvenient time, writing-wise. I'm at an uncertain point in Gossamer, so I need to be able to focus on it, but I guess if I was going to be unable to write, it's better that it was during a portion of the book I'm not sure about.