If the compression is outside the cord, you have more chance of recovery. The CNS itself is thought to not regenerate. But many nerves can be compressed as they leave the cord and become the peripheral system. These have the ability to heal.

I'll be thinking of and rooting for you and your surgery.
Fish oil (a source of Omega-3) and the methylation vitamins,
methylcobalamin, methylfolate and activated (P5P) pyridoxine, are the helpers with nerve repair. They are the major ones.
Vit C and antioxidants are also helpful. Choline also is useful for repairing cell membranes.

You can add any others you choose as well. After any surgery zinc (in moderation) and good sources of protein will aid in tissue repair as well.