Are you in the US? If so, we Yanks are protected by the Americans with Disabilities Act. Employers are required to allow situations where an individual must be allowed to take care of themselves. For example, I get to use the womens lactating room (the one where breast feeding moms can pump...
Also keep in mind that where you inject insulin can affect its absorption rate. I find that if I inject into a muscle, it starts working faster than when I inject into fat.