Assuming you do have ADHD/ADD, your doctor will be willing to evaluate you, unless you already suffer from A psychosis related disorder. Why? Because of the risk of 'stimulant psychosis'. During the time of risperidone I was taking, my weight went dramatically up, which made me ask my psych for appetite suppressant. He said no way, you know why.
There is also some data out there showing an increased risk of stimulant psychosis for people treated with ADHD medication. Look it up.