i dont think they can deny you if you are in that much pain.........
.. anyways, good luck getting them to change their minds, mayeb you can get the insurance company to change their attitude adn go to a different doctor just this once (maybe your doctor can refer you to a specialist)........ i have had problems just like you, unfortunatly they found that i have really bad arthritus, is there a pool in yuor backyard? does anyone you know own a pool????? i have found that the cool water really helps with relaxation, and of course in water you are weightless so there isnt as much stress on your joints