I think it’ll just take a little time to adjust. It’s great news that it worked, even if it was brief. Nerves are strange things when they’re not used for a while, and the process that takes place when urinating is an extremely complex set of signals between your brain and a number of muscles and chemical receptors. A little off and nothing happens. It just takes time for your brain to figure it out.
After my surgery I couldn’t walk for a few months. During the latter part of that time there was no reason why I physically couldn’t, but the signals that my brain was receiving from my legs didn’t match up to what it expected. I literally had to learn how to walk again, which was incredibly hard and frustrating. Tonight I walked into my house and felt this strange feeling, almost like my mind was excited about something. I suddenly realized that my stability and dexterity was back. My brain finally remembered, which is what my physical therapist said would happen eventually. It was a massive relief.
Try not to get discouraged. Our bodies are amazing machines, trust that yours knows what it’s doing.