If you were to have surgery and if it were without incident, and you healed completely, you MIGHT be able to go back to heavy work after the first year. (It takes a good year for the bone to grow in strong and "set"). But I would say that chances are equally good that you could go through surgery and still end up not being able to resume your current occupation. I'm not sure how heavy the workload is, but I can imagine it is hard on the spine, right?
I also would imagine that trying to continue with your job while you are attempting to make your back better through conservative means is going to be close to impossible. Usually in order for the spine to heal, you have to stop doing the activities that got you into trouble in the first place.