As a tutor I find many children are misdiagnosed as having dyslexia, ADD and other learning abilities (even by doctors).
Hands on learners, active children who are under stress (because the structure in the school system does not allow them to release energy, and sometimes diet), children who's learning time clock do not fit the one size fits all approach used in the public school system, ext are often misdiagnosed as Attention Deficit, Dyslexic and other learning disabilities.
Here are some articles that will help you greatly in deciding what your course of action will be. I recommend medication as a last resort.
The Hands On Learners
http://www.read-phonics.com/parenting-teachng-learning-styles.html
Brain Research On The Effects Of Stress And Learning, and how to help through diet and other procedures.
http://www.read-phonics.com/learning-disabilities-cortisol.html
Un-schooling
http://ezinearticles.com/?Home-Schooling-and-Un-Schooling&id=2620009
Better Late Than Early: This book is an excellent resource for understanding children's natural learning time clock. The authors back up their findings with scientific research, and experience. The book is out of print, but used ones are available at a reasonable price on Amazon.
YouTube Video of a Tutor using homeschool curriculum/ games to help children with dyslexia
http://www.youtube.com/watch?v=Qt8Rp7yR7is
I ( and many homeschool parents) have helped lots of these children without having to resort to medication, and with a little information it is easy.