Keep going on the PT. I have kept up with PT for my cervical fusions. I was fused C3-7. The first hint of bad posture, I do the PT I learned at home.
Three months isn't a long time in your recovery. I am no spring chicken either, and it took me almost a year before I really felt healed. Just keep up with the PT and do your best not to strain at home. It will get better in time. ginnie