How exactly did this become an issue?
I would just squash it by getting a doctor's note. You likely wont even have to deal with the doctor-- just speak to the secretary and let them know that you need to have a note stating that you need access to the "facilities" as needed. Trust me-- they'll think it's as ridiculous as you do, and they'll sympathize. If the doctor even questions it, let them know how you are only being allowed to use the restroom every 4-5 hours, and with the 8 servings of water you drink per day (riiiiiight?) you simply can't hold it in that long!
Really, it IS really bad for you to hold it anyways.
I tried to call the corporate line, but it said the "wireless number i'm trying to reach" wasn't available. I used the number Hardlinesmaster had on his sig.
A few hours after that I recognized that there probably wasn't any point in calling and that I would essentially just reduce my hours and get treated worse. I mean, it's a real complicated decision to make especially given that this is my only job.
Better to just let it go....