Alternatives to Zoladex and Tamoxifan? & Genetic Testing for Drug Metabolism

I'm not good at computer stuff, but for those interested in the metabolism of opioids and the enzymes involved, google this.  Opioid Metabolism and Effects of Cytochrome P450 / Pain Medicine... According to a professor at the pain clinic of the large Sydney public hospital where I'm a patient, I lack two enzymes needed to metabolise opioid based medicine. This is why any of them just make me violently sick and do zero for pain. It's a long and detailed medical article, but explains very well the link between enzymes and the metabolism of numerous drugs.