I am so sorry for your cancer diagnosis. I have had a hysterectomy but that was due to endometriosis. But I don't take ketamine so I can't give any advice on that. If I were you I would talk to you pm dr who administers the ketamine and any other pain meds you take for your CRPS and make sure he talks to your oncologist about how to treat your CRPS while going through surgery for your cancer. I would also make sure the hospital staff is aware of your CRPS and the meds you need to have to manage it as well as the meds you may need for your cancer. Again I am so very sorry for your cancer diagnosis and am sending many heartfelt prayers your way.