I will be the first to say that ADHD is definitely over diagnosed. Still, as opposed to other "throw away" diagnoses, I cant think of a single person with ADHD who likes being in the patient role. If anything, we are embarrassed by the fact that we have to take a pill just to do what other people do without it.
Before I was diagnosed as an adult, I could never hold down a job. I would get distracted from task to task. I would day dream, I would loose things, forget to finish things, get distracted, all on a daily, even hourly basis. I worked as a waiter, and I would go to the table, take their drink order, and go to the back of the kitchen and get totally distracted by something else, and not only forget to get the drink order, but even forget to check on the table until I walked back out and saw them staring at me.
I worked as a bank teller and i got fired because I forgot to close the gate to the vault. I would go through every day making mental lists of things I needed to remember to do at work. I would always forget one or two of them, and I would get in trouble. And i am not talking about forgetting major projects, but forgeting to lock my cash drawer when I walked away, forgetting to count my money two times.
I would loose my keys and wallet constantly. I would have something in my hand, put it down absentmindedly, and then spend 30 minutes looking for it. This would happen several times a week.
School was not difficult, I just would get distracted watching TV (the only thing that could hold my attention for hours).
After getting fired yet again, and realizing that if I didn't get some help I would be 45 years old still working as a waiter or in some burger king.
When I went to the psychiatrist, I explained everything above. i said to him. This wasn't some acute change or even a gradual decline. I cannot remember a time when i was not like this. I don't know if everyone has these kinds of problems, and they are just better at dealing with it than I am, or If there is something wrong with me.
Imagine if you were born far-sighted. Everything around you is blurry. You walk into walls, you can't read, you can't drive, but you have no concept of clear vision. Since your vision has always been that way, you assume that you are just as normal as your peers, except they don't run into walls, they can read, they can drive, etc. From this it is easy to see how you and others could think that you are stupid or incompetent.
For a person with ADHD, taking medication is like a far-sighted person putting on glasses. When I first started taking Strattera, I didn't feel any different, I took it for several months and wasn't sure if it was working or not. I didn't feel the way I had felt when I was taking Ritalin as a kid, and because I didn't feel drugged I wondered if the medicine was even working.
Then one night I went to my job as a waiter, and after about an hour of forgeting orders, getting distracted, and struggling in general I realized that that was exactly how my job would go before I started medication. It really shocked me that I had lived that way so long. I know not everyone has positive results, but the only time I could tell the medicine was working was when I would forget to take it and revert to my inattentiveness.