What should be done to help my completely severed nerve after lipoma removal on back right of scalp/neck? (Photo)

40 male with 6cm by 3cm by 2.5cm lipoma on the back right side of my head slightly growing into my neck muscle. It became infected so it was decided that it had to come out so i had the proceedure. During which the occipital nerve was severed resulting in extreme numbness on 25 percent of my scalp along with burning and shooting pain up the right side of my neck through my scalp and into my right eye. It has gotten worse over these 4 months with no end in sight. What are my options? Please help!