I have similar things going on (along with numbness and significant loss of dexterity) from a crash New Years. I had an MRI scheduled, but my insurance company cancelled it because they wanted "more information".
One of the guys I ride with had something similar for years and ended up getting Ti rods inserted in his neck (I need to get more details from him), but he said that once the pressure was relieved on the nerves, the muscles relaxed better than he ever remembered and his strength came back.
Something else weird I have going on is that my muscles cramp much more easily now, escpecially on the side most affected.