Mercury poisoning has been implicated in ADD, and it sounds like that's what you're talking about.
The sides of your brain above your ears is where the temporal lobes are. They relate to memory and mood swings, among other things. The best book I've found for explaining what each area of the brain does and how it malfunctions in ADD is Healing ADD by Dr. Daniel J. Amen.
This is a brief description of the 6 types:
Dr. Amen has identified six different types of Attention Deficit based on these brain imaging results. He also found that each type of disorder responds to different medications. The types are:
1. Classic ADD-hyperactive, restless, distractible, and impulsive.
2. Inattentive ADD-space cadets, daydreamers, couch potatoes.
3. Over-focused ADD-trouble shifting attention, stuck, obsessive and argumentative
4. Temporal Lobe ADD -aggressive, memory problems, headaches and dark thoughts.
5. Limbic ADD-depression, negativity and a negative internal filter.
6. Ring of Fire ADD-angry, overly sensitive, moody and oppositional.
This is a pretty good article on the 6 types:
http://www.mindpub.com/art402.htmhttp://www.mindpub.com/art403.htm 
