I have been doing NAET treatments on and off for the past ten years. I have never had a NAET treatment where light was used. You are not getting the true NAET treatments as Devi is teaching them. That may be why you are having a reaction. Read Devi's Guide book as it will explain what the treatments are about and what reactions you can have. I did have a bad reaction when I treated Vitamin C. Was sick with flu like symptoms for 3 days. Went back to pr and found I hadn't cleared the Vitamin C completely and had to do more treatments with combinations. After I cleared it with all combinations I felt much better.
Here's what my typical NAET treatments have been:
Muscle test holding vials to determine the allergies. Treat the basic 15 BBF, vitamins/nutrients, foods first. Must clear those before anything else can be treated unless there is a major health problem like hives going on.
A treatment consists of holding the vials while the pr uses their hands or a tool to go down the points on your back while you breath in a certain pattern. My pr does tapping on my back a total of 12 times. Then she does the gate points on hands, arms, legs, feet. I am told to avoid the item for 25 hours and massage the gate points every two hours while awake.
When I first started NAET, I was allergic to more than 50 items per RAST and skin testing. I am now completely cured of all of them. (Recent skin testing was completely clear.) I can eat any foods that I was previously allergic to and no longer have a problem with any type of pollen or outdoor plants.
Unfortunately I am prone to developing new allergies so I continue to go in every year or two and recheck to make sure my treatments are holding and clear any new allergies that have developed. So far I have only had two items that I had to be retreated on.