Here is a link that provides a survey of existing treatments and how they were rated by people.

http://www.drkatherine.info/environmental_medicine/Treatment_Research.htm

The treatments discussed or posted here are in no way an endorsement.  They are purely for informational purposes. 

EEG Biofeedback / NeroFeedback

http://www.eegspectrum.com/

Here is an video on how it helps with ADHD.

http://www.connectwithkids.com/tipsheet/2006/274_mar29/thisweek/060329_adhd.shtml

Still learning about this.  More to come.

Allergy Elimination Techniques

http://www.naet.com