My Dear Meg,
Let me help you drop kick this Doctor for his unprofessional behavior and his judgemental attitude. He appears to have the bed side manner of a dorrito chip and you have nothing to feel guilty about.
You suffered a serious head injury. Perhaps he should fall on his head and he might wake up and find out physicians are to be emphathtic. Concussions are traumatic head injuries that occur from both mild and severe blows to the head. Some head injuries may appear to be mild but research is finding that concussions can have serious, long-term effects.
Labeling you as a "junkie" is setting you up for others to follow and not take you seriously. I would certainly talk with your primary care physician re this other Dr. and write a letter to the Administrator of the clinic.
You have overcome your past issues and you will continue to do so; don't let this set you back. Let out those tears and then remember how proud you should be of yourself.
If you continue to feel so dizzy and cannot live your life as you were before the head injury, please seek out another physician that is willing to listen to you and not judge you. You have patient's rights.
I am right here for you so know I care. Hugs sweet Meg.