I havent had to use that, but my father did. He had prostate cancer, spread to lungs, bladder, bones. We took care of him in hospice care, when his pain got to a point that the pain meds weren't working they put that on. For a longer smoother control. She told us the patch would take a day or so to get into his system, then it would slowly release and keep it in his system. Rather than having the up and down spikes that pills or shots seem to have. He done better with it.
Hope you find something that works for you! Keep fighting it.