Sweetie, no one has diagnosed Monk with anything. He IS obsessed with cleanliness. You said yourself you will not get into anyone's car unless you know it has been properly disinfected. This, and some of the other things you said are a bit over the top.
I think working as a CNA will be incredibly stressful for you, as it would be for Mr. Monk if he were to choose that line of work. I can see you working in a field that requires very meticulous attention to detail, which is a highly sought-after trait in many industries. I do wish you the best in whatever career you embark on.