Hi, thanks for writing to HCM.
Based on the description, I suspect that you might have suffered Clay-shoveller's injury
of your lower cervical or upper thoracic vertebral
spinous processes secondary to a lifting of heavy weight or load which might have went unnoticed.
An xray of the involved area will diagnose this condition.
The general guidelines of treatment are as follows -
* Avoiding activities which puts more strain on the involved area
* Ice packing to resolve the pain & swelling
& anti inflammatory medicines as needed
* Physical therapy
in the form of moist heat application to relax the tender muscles
Hope this information is helpful. Good day