C.,
Chronic tension is often a painful result of anxiety.
All of the above is great advice...and I will just add to the list of ideas.:)
Stretching. Look up some good stretching exercises on youtube for latimus dorsi (lats) and trapezius muscles. Practice these daily for relief.
Here is a great exercise to try as well.
http://www.stress-relief-exercises.com/progressive_muscle_relaxation.html
Wishing you relief!
S.C.