I think the memory loss and just not feeling quite "sharp" anymore was one of the most frustrating parts for me. In the beginning it was very severe and if it weren't for the information that I got from this board, I don't know what I would have done. I have great doctors, but neither one of them have been through it themselves!
It took way more than a year for me to get back to close to normal. I'm not sure that I will ever feel quite as "sharp" as I did before surgery, although that may be the beta blocker talking.