I don't remember getting those symptoms as much as having anxiety in spades. Having said that, if you're really starting to feel depression, it might be time to talk to a therapist who specializes in this. Perhaps your surgeon / oncologist can recommend someone.

Even if you feel it may not be at that level yet, better to "nip it in the bud" now so it doesn't have a chance to get worse.

If nothing else, perhaps look into a PCa suppport group. Maybe having contact with folks who are facing the same thing you are will be enough of a positive experience to help, and / or, they may be able to recommend someone if it's time to talk to a professional.

Best of luck to you!