My second was C3-7 also. Have you asked your doctor why posterior rather than anterior? Going from the front in most cases is less traumatic. I would ask about this.
This surgery isn't easy, but it can and does get good results. I hated to go through another one too. Make sure you are on the same page with your doctor about after surgery medications. Also while in recovery, make sure they know what you were taking before the surgery. They did not do this for me, and I wound up for 24 hours not having enough pain medication. What I was taking at home was not accounted for.
Do you have help at home for awhile? If you have any specific questions, I sure will try to answer them for you. I hope that your surgery is successful and that you get the relief you need. ginnie