Your complain suggest that you are having symptoms of cervical spondylitis
. i would suggest you to take following steps.
1.Avoid using very high pillow or a very soft mattress
2. Take tablet Pregabalin
and Methylcobalamine daiy
3.Apply hot water fomentation and Diclofenec ointment at neck
4.continue doing neck muscle strengthening exercises
5.Myoril or Myospaz are muscle relaxant
if pain and tightness is very severeMRI
needed if symptoms persist after these steps.