Actually I am glad you wrote, as I have been feeling very similar to you. I had RP on November 9, 2009 and have read so many posts about how easy everyone had recuperated from the surgery I wondered what was wrong with me. Now, I see there are more writing about longer term discomfort than I have read before. So, while I do not wish that on anyone it is good to not feel so isolated and alone.
A few things have been said here that I would question, with most of my data having come from my own brother who is a surgeon. First, I doubt anesthesia has much to do with anything you are feeling, as it mainly leaves the body within 24-36 hours after surgery. Second, while da vinci is minimalized as being superior to open surgery, it is primarily superior for it's less invasive cutting to get into the body. Once it penetrates the body, it is still heavy duty surgery and not much different from open.
I have been lethargic, in pain abdominaly, and lastly been hit with constant neck and shoulder pain with a fairly constant numbing of my left arm since surgery. I am lucky I work at my own pace from home on the computer. To this day I am on pain meds - some days more, some days less. I hate them but need them.
This Wednesday I am going to Minneapolis (I live just outside of Detroit) to see my brother and getting second opinions from doctors he has scheduled to look at me, primarily a urologist and an ortopedic surgeon since my back got so messed up from the position of surgery, which mine took 7 hours due to blodd loss complications
In closing, just know you are not alone. I know it seems weird to have lingering affects. My neighbor is 10 years older than me and had the same surgery 2 years ago and did play tennis without a problem 4 weeks after surgery. We are all different. We all need each other. This is a good platform to ask questions