question of misdiagnosis

I am a college freshman and I have just been told that I may possibly have A.D.D. However, it my attention span seems alright and I am not hyperactive. A friend of a friend said that she has a learning disability whose symptoms are sometimes confused with A.D.D. Could this be the case? What is this learning disability called? Has such a misdiagnosis ever happened to anyone else?

I work as a private tutor, and many students come to me after being called "dyslexic" and/or ADD and/or ADHD. These are not proper diagnoses, just undereducated and overstressed school personnel trying to find a pigeonhole to shove a difficult student into; almost always these terms are wrongly applied.
Then on the other hand I meet a LOT of others, especially the young men that I rent rooms to, who have every possible symptom of ADD but have never been diagnosed. Undiagnosed ADD is likely to be over-represented among transient young men, or else I attract them like flies because of my anti-stress lifestyle, or both.

And yes, an awful lot of other things can look like ADD, varying from hearing problems to sleep deprivation to thyroid conditions to allergies to overweight and pre-diabetes to post-traumatic stress disorder, so you are right to investigate.

So I do agree that ADD is often misdiagnosed, both false positives and false negatives. I also always recommend extreme caution in second-guessing diagnoses; go and see a real specialist who has no axe to grind; and just because someone doesn't like a particular diagnosis that doesn;t mean it's wrong -- try to be realistic, inform yourself, and see what really matches and what doesn't.