Unfortunately, I also had good success with the trial. It was done by direct injection into the intrathecal space. First injection was morphine. No relief at all. Just fit of vomiting that evening. Probably five or six times. Until there was nothing left to throw up. Went back two weeks later. Had another injection, this time it was hydromorphone). Within about ten minutes I could feel the pain dropping from an eight down to about a two. Felt great until that evening when the same round of vomiting occurred.
Anyway, I decided to have the permanent implant on April of 2023. They started at a very lower dose that did not do anything. They kept upping the dosage until I asked them to check the pump since I still was not getting any relief. Pump checked out okay. Kept upping the dosage, even after moving to a new state in August of 2023. SStill no relief, even to today, Pain has become worse. Pump still checks out okay...believe it or not. I wish that I could have had the trial with the temporay pump taped to the outside of my back for about five days. The pump is supposed to have a success rate of about 87%. Just my rotten luck to be in the 13% who don't find relief. My advice? Try to get a trial with a temporary pump taped to your back. May get a better idea of how it will work for you.