‏I feel exhausted from speech and concentration problems

‏I feel exhausted from speech and concentration problems My English is not my mother tongue, so excuse me for my mistakes. I have a slurred speech and problems concentrating (I think I have AD) and I work in a job that requires me to concentrate and speak. I missed a lot of important topics that were piling up on me. I felt ashamed of those with me because I asked them a lot to explain what I had missed. I reached a level of frustration that I had never reached before. The thing that bothered me the most was that I began to doubt my sanity, because my mind wandered a lot. And also my hypersensitivity. Should I quit my job and isolate myself from the world? So what is the solution?