I've just become very open about my issues. My leaders know that I get overwhelmed easily, that I shouldn't be left doing one thing all day long, and that I sometimes need to be left to just do one thing and not be bothered with anything else. In turn, I am open about how I'm feeling. When I start my shift, I can tell them, "I'm really struggling to focus today; I'm a bit tired; I'm not all here right now." They know that despite my condition, I'll try my best and they expect me to let them know if I start to get anxious and overwhelmed and need to do something different.
You need to work with people that exhibit empathy and will take your needs seriously.