I talked to my pdoc, and she thinks that the 900mg of gabapentin was just "too much too soon." I'll be taking the 300mg twice a day instead of three times a day.

She said I hadn't been on the higher dose of gabapentin long enough to for it to help with depression.

I hope the problems with the night pills stop now, but I don't expect I'll see any improvement in my depression any time soon now that the dose has had to be cut down.