SMU,
At any time in the past have you been treated for ADHD? Perhaps you can ask your parents if it was discussed with a doctor or a teacher at some point? Maybe it is in your school records somewhere?
If so, then you would be completely justified in seeking treatment for it again from your current doctor.
Talk with him/her candidly and see if you can determine whether this is an underlying organic issue...or a result/side effect for your current Rx.
I hope that you get the answers that you seek in this regard!
Keep posting and let us know what you find out and decide to do.
S.C.