My surgeon's motto was "If something hurts, don't do it." While I found it somewhat annoying and difficult to determine, I do now understand what he meant. He didn't believe in putting specific restrictions on people, as we are all different in what we can do and how we heal.
What I can tell you just from reading your comments, is that you need to develop a little bit of patience. You are typical in that you hated having your activities restricted by pain; you had surgery, and now you're in a rush to get back to "your life" as you knew it. But you can really get into trouble if you rush things along. Almost always, you end up paying for it.
Luckily most people find this out because their body talks back to them...and they cut back a little bit...and, no permanent damage is done. So you need to figure out what you can comfortably handle and what is causing you pain. None of us can tell you specifically what those things are. Now is a really good time to slow down and start listening to your body. I don't think there is something like "pushing through pain" when it comes to your back.
Remeraber it will take at least 6 months for your bones to make a solid fusion, and it can take longer. During this time, you don't want to do anything or have anything happen that will put this process at risk.
But like we've all said, this early in the process, you will still hurt all over and in places that seem unlikely. A lot of this is just the result of the surgical process -- the "weird" way you were placed on the hard operating table, the reverberation of the saw and drill, etc. You were the object of a major construction project!!
If you decide to stay returned to work, try to make it as easy on yourself as possible. Be very sure your work station is set up as ergonomically as possible and that you have a very comfortable, ergonomic office chair. Try to get up and walk every 20 minutes, even if it is just across the room and back. You could try taking a cold pack along and use ice if you start becoming uncomfortable. Perhaps a "back brace" would help. I'm talking about the kind you can find online that is about 6-8" wide, that is a heavy elastic material and closes with velcro. The one I have has two additional "wings" that you pull even tighter and stick with more velcro. This allows you to snug it up even more. If nothing else, it will remind you not to bend or twist and to use good posture and body mechanics.
Hope one of these ideas helps!!
xx M:wave:M