My experience was a lot like Larry's (Mentu) - for the first month I wasn't good for much of anything. Of course, in my case, most of that month was spent dealing with some complications. After about a month, I started to become "antsy" to get back to "real life." I began to do a bit of work from home, spent time here and elsewhere on the web, read, watched mindless TV (is there another kind?), and took my walks. After about 6 weeks I began to go with my wife on her daily jaunt to the fitness center. While she did her workout, I walked miles on the track (it was winter in Chicago). After I did that, my return to normal life accelerated. I was back to work part-time at 6 weeks, full-time by about 8 weeks (10 hour days). I did cardiac rehab during months 4,5 and 6 -- and haven't looked back.
Fast forward 3 years. . . I'm still working 50-60 hour weeks; I get to the gym 5 days a week, and I just live my life. At some point, you will wind up in a similar situation. We all heal at different rates, but with very, very few exceptions, we all heal and go on with our lives.