The understanding of ADHD has come a long ways over the years. We now know that there are many types of coexisting disorders (most of which have been caused by the ADHD or ADD). For example check out my post on ODD here http://www.medhelp.org/posts/ADD---ADHD/Adult-with-ODD/show/1966456#post_9234381
It is possible that with a severe case of ODD, your doctor figured it was bipolar. And maybe not. But, in the good ole days, a doctor was more apt to sedate, then give a stim med.
To answer your question, bone up on all the info you can on ADHD. This is a pretty good site. http://www.help4adhd.org/en/treatment/guides/WWK9
I would also think that a written record by you of the meds tried and their effects would be important.
Hopefully, your doc has experience with ADHD, if not find one that does.
Good luck. Keep us posted as to what happens. It may help someone else down the line! Best wishes and if you need any more info - please post!