Sorry no one answered you. It's all intertwined. Muscles and nerves in that area. You could even have something like whiplash from the head slap and making your head bang in a certain direction. I'd ice it, take ibuprofen and make your partner pay for a massage for you. :>)) Anyway, this was a bit ago so hopefully all is well. I had a neck injury many years ago and it still plagues me with flare ups of pain and headaches.