What doctor did you see in Denver? A TOS surgeon like Brantigan or Annest?

Don't discount expert chiropractic care.
Being a cop can make for quite a few misalignment episodes.

If you can find one that has a low level laser, IF stim and does manual trigger point work or NIMMO and even upper cervical adjusting...it just might help a lot.
Go to a few top choices for evaluations & to get a sense of skills/knowledge.

useful sticky threads- mega crash course for TOS -
http://neurotalk.psychcentral.com/thread84.html

http://neurotalk.psychcentral.com/thread125577.html
http://neurotalk.psychcentral.com/thread135.html