Qualifying for a 3rd class medical certificate?

You can not have ADD and qualify. If you want real details, instead of the usual crap here try www.virtualflightsurgeon.com

You're required to disclose your condition and your medication for the medical exam. The medications are normally disqualifying (with a handful of exceptions), and so is the ADD. However, if you stop the medications, and if your doctor certifies that you no longer have ADD or that the ADD won't interfere with flying, you can get a medical. You may need to get a special issuance. The FAA may make the final decision in these cases (instead of your aviation medical examiner).

In general, as long as your condition is no longer active and you are no longer taking medication for it, you can get your third-class medical. If it is still active, or if you are still taking meds, chances are that you'll be denied the medical.

You cannot become a light sport pilot with ADD or with medications, because you cannot become a light sport pilot if you have any condition that would prevent you from getting a normal medical. The light sport certificate doesn't require that you actually take a medical exam, but you've ever failed a medical, or if you have any condition that would disqualify you on a regular medical, you are not eligible for the light sport certificate. Essentially the FAA trusts you. If you lie, the FAA will likely find out eventually, and you'll be in all sorts of trouble, not just with the FAA but with other parties who may hold you liable for flying while you are not in a condition to fly (insurance companies, for example).

The good news is that you don't need a pilot's license at all for an ultralight, so if you want to fly ultralights, there's no problem. But if you want a light-sport or regular pilot's license, you need to get your ADD resolved if possible (doctors hand out diagnoses of ADD like candy, so just because one doctor thought you had it doesn't mean that another will agree—you might be misdiagnosed).

You do not need to disclose past legal prescription drug use. You do not need to disclose past unconfirmed diagnoses. Wait until you've been off all of these drugs for three years and then talk to an AME. Do not fill out and sign the form until you confirm with the AME that there won't be an issue.

ADD is actually not 100% disqualifying so long as you are not on any medication and have no current significant symptoms. The FAA will even approve Ritalin in some cases. However, this is a special approval that is very hard to get, so you'd definitely prefer not to have ever had a confirmed diagnosis of ADD.

Yes, a valid driver's license is sufficient for a light sport pilot.

Jake - I do not believe you should be flying as pilot if you have ADD -

It could be dangerous to yourself, and to many others -

Such as colliding a lightplane with an airliner full of passengers -

Do some research about the PSA 727 mid-air in 1978 with a Cessna 172 -

It is not you only, it is airplanes and people who share the same skies -

See my email to you . I have shared contact info to a member of the AOPA's Board of Aviation Medical Advisors, A Senior AME who does HARD cases.

Don't mention it unless the MD specifically asks. Its best to play dumb on that one! Yes, a drivers license will be your medical for sport pilot but try to get the medical first.