HI P,
This was discussed recently over here and if you follow this
link you can read some people's experiences.
What you will glean from this that:
1. It is important that this indeed correctly diagnosed and that it very much will
2. Dependent on the severity and specific symptoms whether you can become an ATP
I am not sure if you can fly with any of the medication used generally for people with ADD but that query can be resolved by asking your AME or the FAA.
HTH
FD