A diagnosis of ADD/ADHD is often accompanied by a great sense of relief. Learning that one is not stupid, or slow or even defiant can be very reassuring to both parent and child. Adults who are diagnosed with ADHD have often learned to mask the effects and difficulties that come with disorder. There are very real congitive differences between an ADHD brain and a non ADHD brain. This difference is crutial to understanding and beliving an ADHD diagnosis.
There are many home & self tests that can give take to get an idea if ADHD may be at the center of certain symptoms. However, use this as a starting point to then seek out a professional diagnosis and to rule out other possible disorders or causes of your ailments.