I feel that breakthrough medications should be the same as the extended-release. In other words if your taking ER Morrphine the breakthrough should be morphine IR. It seems to make good sense. Mixing different chemical concoctions in your body cannot be a good thing. If it doesn't work try MC (cannabis) since the relaxation from THC may block pain for you. Personally, I have found self hypnosis and remote viewing easier with cannabis resulting in less anxiety and pain relief. Google Remote Viewing for a new and pleasant experience that may help you deal with chronic pain.