Maybe the reason I've stopped writing fiction isn't because I've lost my creativity, or because I'm too busy with the kids or I fritter away too much time on the Internet. Maybe I've stopped writing fiction because I've already achieved all that I wanted to achieve when I started writing.

This sounds like an important breakthrough to me. It fits with what I've seen you say over the time I've been reading your journal. It seems to me that you have been way too hard on yourself over not writing more. You've already done something good. Mentally punishing yourself for not doing more is looking at things the wrong way in my opinion. That's pretty much what depression is though, isn't it? Looking at things from the wrong, negative side and letting that overwhelm you? I've never been inclined towards clinical depression, so I can't begin to really understand what you experience, but I do know that looking at what is positive as opposed to what is negative is healthier in general. I think that listing your gratitudes on a regular basis is a positive step to take.