Chin up mate...
I had some dep after mine but i had PTSD following my accident.... So cant really comment on the hip job alone....me personally, I dwelled in the macabre and became almost obsessed with the surgery, i read everything i could, trawling the net, watching videos, reading surgeons reports, even looking through catalogs of the "mechanical body parts" ?.... Far too much time on my hands.
But, as we all know pal, what goes up, must come down. After being so elated from the surgery, the hope of improvement, the morphine, eventually you come down .
Just try and be positive mate, its early days , you will be amazed at the progress you will make after a short while but it does take a little time.
With your new bionic parts your on the road to better things.
Try and enjoy the autumn sunshine with plenty of trips out for a bimble along. Don't overdo things either. You need to have the combination of doing nothing and doing everything just right, as doing either one on its own will make you tired and fuel the fire you have burning at the moment.
Be positive, try and see all the good aspects of what treatment you have received and what benefit you will gain.
The pain killers are probably this biggest cause of your depression mate, coming off them i was like a heroin addict. Horrible.
Chin up buddy.