Hey Jellybean, It is okay to vent and you are safe here so vent away. No one should have to suffer in pain and if your willing to go to a pain clinic I do not see the problem.
Which of your physician's usually prescribes the meds to control your pain? That should be the one to write the referral. Your insurance won't let you go to the Pain Clinic on your own without a referral?
Call your Doctors back, don't give up, you are your own best advocate.
Take care and I hope you get some pain relief soon.