ADHD work life issues

Hi people, why am I always sleepy and exhausted? How do you manage this if you also have it? Also, why can't I work or concentrate in office with loud coworkers shouting in their meetings? Others can, but I just can't. Using headphone is not always feasible, also makes me the odd one out, attracts teasing from coworkers most of whom are kinda toxic (people, it's a kinda toxic and sexist environment I work in, with less women around and I am a woman). If you also face the same issue, how do you manage it?