@brandonlucky The Sternocleidomastoid muscles
@Dana are often a problem. It could be that in response to the air horn you reacted with a sharp twist to your neck and that may also reflect to other neck issues.
Loss of normal lordosis from lifting, injury, twisting, trauma or being inherited could be one of other neck issues. Osteoporosis which is the thinning of bone tissue and bone density is also a cause of cervical lordosis. Many problems in the neck can connect to improper alignment. This would not only place the cervical spine at risk, but unbalance the sternocleidomastoid muscles.
When the cervical neck is out of line, sleeping on one side will cause a problem. Non alignment can also cause temporomandibular joint function problems as well as the pulling of neck vertebrates could strain the mastoid area near the ears.
Before any physical treatment with a NUCCA member, x rays of the cervical spine will be given. Even with radiological results, be careful with PT. If there's any joint hypertrophy, facet arthritis, spondylosis of levels c4 -c7 or form narrowing of levels c5-c7, then professional PT therapy may start at the mastoid areas first. If soft tissues are within normal limits then there's probably no acute fracture or dislocation.
There's so many other things to consider. Some are: If sound changes when turning neck, there may be a problem with the upper m. trapezius. Problems with a masseter muscle and modulation of the dorsal cochlear nucleus could
indicate bilateral tinnitus. One sided ringing could be made worse by mastoid pressure or by the mastoid emissary vein.
Try just using some dry heat, then light massages which are temporary until you get a treatment plan in place. Use soft support under neck while sleeping and it's always recommended to sleep on back. Maintain good posture. There's plenty of treatment methods that may help, but have x rays first. The sooner the better.