You might want to check out Vyvanse. It is longer lasting and not as anxiety causing as ritalin I believe.
Also, Two sites aimed at the adult ADD sufferer that you might want to check out are totallyadd.com and http://jeffsaddmind.com/for-first-time-visitors.
Hope this helps
We have add, anxiety disorders, and sensory integration issues going on in our household right now. As someone diagnosed with inatintive ADD I've had sucess with Ritalin. However, there are nonstimulant medications out there that you could ask your doc about. My husband and son are helped tremendously by one of them. I've also been helped with a neurological med called Provigil.
I asked my husband and sons psychatrists about the difference in medications. Both of them say that sometimes one med will work on one part of the brain and other meds will work on a different part of the brain. Thus, even though both can help with focus, one might work for one patient while the other work for a different patient.