How to support a neck injury while laying down?

A little over a year ago I was in an auto accident. My neck is acting up again and none of the 4 pillows I own is doing me any good. (read: wave-like foam ergonomic, half feather/half polyester, firm total polyester, and soft feather pillow) I’m trying to come up with and idea of how to support my neck sans-pillow. Any possiblities?