I was diagnosed with ADHD as a child.

I know very little of physchology, but the behavioural differences between (young) me and other people were noticably significant to anyone in the room. The medication (ritalin) they prescribed had a strong regulatory effect that made me more "normal". I stopped taking it in high school.

I am now sentient enough to reflect on my internal experience, and recently I took my chldhood ritalin dose. The effect is quite noticable; when I took it, I was able to focus for hours on one thing without getting distracted, which I can never otherwise do. I've heard that non-ADHD people do not have such an effect from ritalin. If they did, ritalin would be a major improvement to most people's lives.

Alas I have not found the conscientiousness to actually talk to a doctor and get back on ritalin.

anecdotes for you...

The "Controversies" section of the wiki article you linked is a good starting point.

Quotes:

"Debates center around key controversial issues; whether ADHD is a disability or merely a neurological description, the cause of the disorder, the changing of the diagnostic criteria, the rapid increase in diagnosis of ADHD, and the use of stimulants to treat the disorder."

"[D]iagnosis is more likely to be made in the younger children within a grade; the authors propose that such a misdiagnosis of ADHD within a grade may be due to different states of maturity (...) children born in December (the youngest) 39% more likely to be diagnosed with ADHD than those born in January (the oldest)."

It's en vogue, and the diagnostic criteria are sufficiently vague to ensure that if you want a diagnosis of ADHD, you'll probably be able to see yourself in such a light that you satisfy them. This introspective process may be affected by mental resilience. Self-perception is crucial for such topics. Take a subjectively healthy person to rigorous psych evaluations and watch the diagnoses roll in. Whether we say "he has X, because the criteria were met" or "he's healthy, since he doesn't mind much" depends mainly on how well that person copes with the various stressors and expectations associated with the human condition, particularly in modern times. Some people like having a diagnosis as a coping mechanism, some don't (I'm excluding severe cases).

In short, for the majority of the usual stressed out first world population, including run-of-the-mill ADHD cases, whether you get the diagnosis or not is a choice you make.

I've interned at a psych clinic where anyone unfortunate enough to walk on the street after heavy drinking wouldn't leave without being diagnosed with paranoid schizophrenia. There's go-to diagnoses subject to cultural trends and trends within the medical community. I count most cases of ADHD (that I know of) among those.

My suggestion: Find a psychiatrist who is willing to let you experiment with medications and see what works. Try all of the different stimulant types, starting with the oldest (because it's the best-understood). If none of them work for you, then you'll have to find other means to work on your focus issues; talk therapy is not likely to make a difference. I'm sure Ask Metafilter can recommend someone in your area who fits this description.

Actually, there are a whole bunch of distinctions within ADHD.

First, there's the common ADD versus ADHD. But a Dr. Amen makes multiple distinctions beyond that. He's got six types. In terms of satisfying your standards for ADHD being real, he classifies based on SPECT imaging and behavior, claiming correlation, though I can't remember the specifics now.

I'd say that the brain can screw up in lots of ways, and lots of those ways get called ADHD, but I would expect fuzzy and sometimes contradictory classifications because most are based on behavior, and not on detailed white box measurement of what is going on in the brain. Different ways of sub optimal function will get boxed together based on some behavior, but then unboxed with finer parsing of the behavior.

http://www.amenclinics.com/conditions/adhd-add

I was diagnosed, or at least given the option of trying medication once. Adderall didn't do anything for me. But I read up a bunch, as we are wont to do around here. One theory not generally advertised is that ADHD is about having too low a basal level of activity in the prefrontal lobe, so that you're too easily distracted by acute stimuli.

Be wary of self-diagnosis. As you probably already know, it's really easy to introduce bias into self-analysis.

Is there a way respondents can code their answers so that jsalvatier can perform an analysis while blinded? For example, don't just say which behaviors are associated with ADHD. Instead, ask a question about whether he exhibits certain behaviors which may be correlated (or negatively correlated, or not at all correlated) with ADHD. But only include which it is in a rot13'd paragraph.

He can first answer that question and then decode the rot13 "answer." This would give him much clearer, unbiased evidence.

EDIT: An (obviously untrue) example for clarity...

Do you like popcorn?

Fhpu naq fhpu n fghql sbhaq gung n yvxvat bs cbcpbea jnf fgebatyl cerqvpgvir bs fbzrbar univat NQUQ.

I'm given to understand that people with ADHD react differently to caffeine and Ritalin than other people do. They calm down people with ADHD, and have the opposite effect on people who don't.