I was a little hyper bastard, so I was diagnosed as ADD when I was in like 4th grade. I had to take Ritalin throughout all of elementary school. I quit when I started high school, but started again for college, because I couldn't even read a book, and couldn't pay attention in class. After I started back on it, my grades went from C's and D's to A's and B's. I never should have gone off of it, since my grades were always worse, but being the hyper kid in class who had to take "hyper pills" and getting made fun of for it by other little kids made me always want to try to do without it. I haven't taken it since college, but I've thought about taking it again, since I have a hard time working sometimes, and still have a lot of trouble concentrating on reading.
ADD is a cop-out diagnosis for a lot of kids nowadays. When I was a camp counselor, quite often HALF of the 10 kids in my cabin were on Ritalin. I'm convinced that people just use it to stifle annoying, goofy or even free thinking kids who just want to be themselves. There's no way half of kids need Ritalin.
As far as high school and college go, you definitely know if you have ADD. It isn't a matter of going to a different Psychologist. It's like someone is constantly changing the channel in your mind. It is almost impossible to pay attention in class, you can barely read because you keep thinking about other shit- quite often you read an entire page and then realize that you have no idea what you just read. You also retain very little, even if you WERE paying attention.
You may want to go to a Psychiatrist though. A Psychologist is more of a therapist, in that they can't prescribe drugs, and they aren't doctors. While he may have HEARD one drug was bad, a Psychiatrist would be able to tell you for sure, and what he/she recommends.
There is a website to check out.
http://www.adultadd.com/index.jspThey have a lot of information, and even a test for ADD that you can take yourself.
With pretty much all of the drugs available, there are side effects-including the dreaded "sexual side effects," (Men can't get hard, and Women's downstairs have the sensitivity of leather) but it doesn't happen in all people.
The behavior modification treatment is pretty much bullshit. I tried to read a book about how to control ADD without drugs, and I couldn't get through it enough to figure out what the hell it was talking about. Behavior modification to control ADD works about as well as when gay people go to those religious camps to get "reprogrammed" so they aren't gay anymore.
If the ADD is affecting your life that much, get the drugs, then deal with the side effects and decide if they're bad enough to stop taking the drug, or switching to another. The drugs are well worth it, and the difference in your concentration ability is day and night.