I've found a series of videos on VideoJug, featuring Dr. Harold Kaiser, a practicing allergist and clinical professor of Medicine at the University of Minnesota Medical School. In 7 question-and-answer formatted videos, Dr. Kaiser discusses the allergy basics, allergy detection, allergy prevention, allergy treatment, allergy basics for the patient, childhood allergies and other common allergies. I've embedded the last one below so you can watch it directly here:

VideoJug: Common Allergies
If you liked this video, just click on the links above to watch the other parts of the interview with Dr. Kaiser