The post-op depression that many feel is a combination of things, anethesia, change in hormones, and the fact that they have spent so much time and effort leading up to surgery that it is a kind of "now what?" moment. Other things that play in as well are things like final results/appearance are not immediate, as one heals one wants the healing to be done but it take a while. This is no over night miracle. For some people, who may not have any support structure, the healing process can bring about even greater feelings of loneliness, this is a time where you need help and people around occasionally and if no one is there it can be depressing. One has to be prepared for one or all of these possible causes of post-up depression. I hit just a little bit of it after going back to work, and realizing my energy was not up to snuff yet and I had some minor issues with healing the first week back at work. Once I got through that I was fine.
This may seem scary, but if you are prepared, have a support structure(whether friends of therapist), and are aware that it may come, you will likely be fine. It's good you have goals and things to focus on, that will help. I had school and a new girlfriend to help me focus on new things and not get the "what's next" blues.
