as i am not a doctor i won't even speculate on what injury or issue you may be having. however you may try having an mri done that was how i found out i had herniated the c5-c7 vertebrae in my neck in a car crash.
prolonged neck stiffness after accident. i fell down while mountain-biking. i went over the handlebars and hit my head and chest pretty hard. i was wearing a helmet and a chest protector and both of them had cracks as a result of the impact. the helmet strap had "strangulated" my neck pretty hard. ever since i have been continuously having a sensation of strangulation especially while lying down. it has been a month now and i'm having extreme anxiety about having to deal with this forever. a ct scan was normal. can some test help?