Veterinarian please, have questions about my pomeranian's trachea and back?

I took my 5yr old pom to the vet today because of his coughing and not jumping up on things or doing stairs anymore. The vet showed me the xray and he has degenerative disc disease in his back in 3 vertebraes and his trachea is constricted alot. The vet put him on temeril and methocarbamol. How expensive is it to get an opinion from a respiratory vet and have an scope test done? What is the outlook for this condition? Thanks