It could be due to cervical spondylosys or spondilitis. Both of them mean the same.
Confirm by x-rays of cervical spine ap & lat. Views
no pillow under the head
Do neck & shoulder exercises.
Any way take caldikind
plus (mankind)1tab odx10days paracetamol
250mg od & sos x 5days contact me again need be. Make sure you are not allergic to any of the medicines you are going to take. B
since you have to travel a lot, you must keep a cervical collar with you all the times.