I had L4, L5, and S1 fused in 2014. I wouldn't be working and enjoying life today if I hadn't gotten it done.
Be patient on the healing process, it takes a long time, I bet it was 4-5 years before I was completely healed.
I'll give you 3 pieces of advice.
1. be sure of your doctor, if your not don't let him cut
2. Don't be an idiot and over do it, it will stay with you for the rest of your life.
3. Do exactly what your doctor says, listen to every word or it will stay with you for the rest of your life.
