Hi there. You just had major back surgery. I think your pain you are experiencing sounds extremely normal, and I would respect and expect this to occur.
It's going to be weeks before you feel like you are onto that "pain free" road. I hope this solves your issues and that you have no more.
It's is entirely possible that you may not be pain free even after the healing is done. What did you doctor say to you regarding this?
Please don't have too high expectations right now. Even with the high tech surgeries out there.. it's still back surgery and you have to allow yourself proper healing pain/time/etc. In the coming weeks you will begin to notice improvements and hopefully less pain as the days go by.
Between 6-12 weeks.. you should begin to see things dramatically improve and then more and more.
Hang in there. Be kind to yourself.. rest and heal.