You might try magnesium supplementation, then. But take it at a separate time than you take your meds, as they interfere with each other's absorption.
Are you on medication for anxiety? I ask because one possible cause of this problem is lack of magnesium, and the meds used for mental illness all interfere with its absorption. Magnesium supplementation might be the quickest try to fix this. And do you stretch?
is it constant? 24/7? Better with rest?
How long have they been aching?
And to answer you question, YES, it can all be from anxiety.
My cousin had this as a symptom, and it went away after therapy. :)
Feel better!