I also struggled with post-op depression lasting about 2-3 months. I went off hormones 3 weeks in anticipation to surgery, and didn't restart for another 2 weeks after. I creamed me, emotionally. Also, the breast development that I had gotten over the course of 2-3 years seemed to disperse while I was off hormones. That, also, was very depressing.
For me, the inactivity, continuing dull pain and dilation schedule put me in a funk. Only as my strength regained, and I could get out for walks did I start to emerge from the depression pit. The fact that I had lost my family right before surgery also was a hit.
Hang in there, it does even out and get better. I suggest you keep a calender and journal your days. Put down when you have a high energy day, and when you have a low one. Also mark what you did each day of note. Eventually, you'll see that more and more days in a row will be high energy days. You might find yourself forgetting to journal your days. It's about that time that you'll find yourself well again.
Good luck!