Problems with my job?

i don't know what to do because i keep on messing my life up. I suck at my current job at a pharmacy because of lack of attention to detail. I have self diagnose myself with adhd and it is ruining my life. I'm not doing my job good enough and being yelled at every single day. Today my boss asked for a assignment that was suppose to be done by today. The thing is that i have been having trouble recognizing c2 drugs, which are highly monitored by DEA. She gave me a list of drugs and wanted me to identify the ones that are c2 and return the form to her. The thing is that i lost the form and had to print a new one from offline. I did the assignment today even thought it was given to me a week ago but wasn't due until today. She got super offended and said i should "have had the decency to tell her i lost it". She then went on to say " at least i know the type of person you are". I don't see why me turning in an exact copy of the same form she printed from offline such a big deal. I know that i'm not good at my job but i try very very hard and i'm never late or call in. I even agreed and work at another location within the company on my days-off to help out. That being said, i don't want to quit because it's the most money i ever made in my life. I get pay so much money but at the same time get treated so poorly for someone who is just f-ing trying to learn the ropes. She has cut my hours down to one day a week and the other store gladly put me on their schedule for the days i'm not working at my main store. which i don't have a problem with because her store is ghetto and very unorganized. Even the employees their are ghetto and it's a nightmare to go into work their. I would love to ask for a transfer and go into a more decent environment.