My suggestion is to be concerned about a misdiagnosis regardless of how probable it is. Especially if they suggest medication. Medication for ADD or ADHD given to a child without this condition may not only be ineffective, but have extreme negative effects. If you decide to try any suggested course of action, be aware of signs the suggested action is ineffective or resulting in negative effects.

So basically educate yourself as much as possible before trying any new course of action and be prepared to watch as closely as possible for any changes. Record any observation of change, even the minor ones. Discuss these observations as quickly as possible. Consider multiple sources of expertise.