Welcome to the group Dillpickle!
All of us here share many of the same concerns and you will find a lot of helpful and very knowledgeable people.
It is good that you have begun urological testing. While the tests are a bit annoying and mildly unpleasant, they are essential for your understanding of your medical situation, as well as for your urologist. They helped me learn what my limits are and what to expect.
Re work, if you wear a diaper (and do it correctly) there is absolutely no reason why anyone else should know. If other people can tell you are wearing a diaper, you are doing it wrong.

With a premium diaper (and perhaps a booster pad) you should be able to make it through a five-hour shift with no problems. As long as you can do your job, your employer has nothing to say about your wearing a diaper and you have legal protection. In fact, based on what you have said, wearing an effective diaper should cause your work efficiency to increase!
--John