That is a great idea. I was having trouble with my insurance company and with therapists' offices when I was trying to find a therapist for my current depression. I actually discovered that my insurance company has a health service who provides and advocate for "complex cases"... they assigned me a case worker and she ended up finding me a therapist and a psychiatrist.

I tend to feel that when an insurance company denies a claim or medication that that's it... But reading the experience of others I guess that is not the case. Maybe they push it to see who will fight back. Maybe it is your right to dispute the denial of medication... Something an advocate might be able to help you with by calling them on your behalf.