I have been reading a book by Dr. kenneth Bock and Cameron Stauth " Healing the New Childhood Epidemics".  Your symptoms of your son sound very much like many in this book. I have a son who is ADHD but not severe but I have been researching alternative ways to treat him.  This book has been a HUGE enlightenment.  It covers, the Austism spectrum, ADHD, Allergies, and Asthma.  I got my book from our library if they do not have it I recommend buying it.  I am sure it will be worth it.  it is a thick book but please don't be overwhelmed it is an easy read and easy to understand.  Also you can look up the Rhinebeck Health Center which he co-founded to get more info.  I hope this helps.  I would love to know.  Good luck and stay strong.