Sorry to hear of the challenges you are experiencing. WHEW! Now that is out of the way, I have some questions.
What kind of job do you have? Is it too physically stressful for you, and causing you to go low? Or are you forgetting to take insulin/meds, and going high and getting weak/tired?
What is the concern about you taking breaks? Are you taking them too frequently? At inappropriate times?
Could you be reading too much into the situation? Maybe it has nothing at all to do with the diabetes.
What should you do? First, examine your own work ethic. Are you working to your potential? Are you in the right job for you (and there is no reason a well- controlled, otherwise heathy diabetic can't do ANYTHING)? If you enjoy your work, and are performing your job well, then be honest. Ask your boss if there is any concern about your work. Ask if you need to make improvements in any specific areas.
You asked about our own experiences. In my case, I was rapidly going blind, and could no longer perform my job functions to the maximum level. My mother passed, and I needed time from my job. While I was away, my desk was cleaned out. To tell the truth, I was relieved...I didn't want to work anymore. Too difficult to do things without sufficient eyesight. And the "problems" on the job had little to do with the diabetes, and more with "other things" that were going on...but that was me.
Hope things work out for you...always for the best! HUGS! sheryl