Actually, the sensor is super easy to hide (especially with long sleeves) and injecting is also quite discreet these days. I've seen injectors that are about the size of a marker or a wireless earbuds case. It's easy enough to go to the bathroom right before lunch or when you get an notification on your phone.
I'm not diabetic but I'm pretty sure what you describe would cause a lot of stress, especially if you don't want anybody in the office to find out... "hey you have a small bladder maybe?"
Stress has an impact on sugar levels, making it harder to regulate.
If you think knowing of the medical condition is bad for your career at your current employer, maybe it is better to switch employers.
