P.M.
NAET is a drug-free, alternative process that combines acupuncture-like or acupressure-like treatment in combination with carefully timed exposure to or avoidance of each allergen. I undertook a course of NAET about 10 years ago. At the time I was disappointed: it was extremely expensive and time-consuming, the protocols were very demanding (possibly hard for kids to stick to), and I thought my practitioner, who was new to the process, was a little uncertain and inconsistent.
Not all of the allergies I was treated for got better. Interestingly, though, one of my worst allergies (to grass pollens) has been noticably less severe since then. I honestly can't say whether or not this has anything to do with the treatments, but the timing would suggest that it is possible. I wonder whether a better-trained practitioner would have given me better results.
Having said this, I find I am not really comfortable recommending NAET. The official website does a lot of vague verbal gymnastics that are clearly not objective. The training of practitioners, as I heard about it, appears to be set up as a money-making business for the trainers. I trust implicitly that most health practitioners (of any technique) are sincere about wanting to help alleviate suffering. At the same time, I've known some who are untroubled by profiting from other people's suffering, and cast about for a "niche" that's unique enough to attract paying customers. I suppose that's the way the world is set up, but I'm not comfortable with it. Before anyone undertakes this or any alternative therapy, I strongly recommend you google it and read the claims, the praise, and the criticism.
By the way, I have tried other therapies that I found to be well worth the expense and time required. These include acupuncture, which I plan to seek out again, and homeopathy, which has given me very good control of many allergy symptoms. Individuals respond very differently to these therapies, so approach anything you try with your eyes open.