I've also wondered if I have ADD or if it is the result of my anxiety disorder (OCD). I take Provigil and it helps so much. I have a lot of difficult with motivational issues and I can't imagine working without taking Provigil. I'm at the point now where I don't care what I have, as long as the medication I'm taking makes my symptoms better. My Pdoc told me that some people are sensitive to stimulants like Adderall, it depletes them of serotonin. I guess they have to also take an antidepressant. This happened to me, I took Adderall for about 3 months and became totally depressed. Provigil doesn't do this to me.
Be well.