Rather than an allergic reaction, you may have been experiencing a parasitic die off response. When I started the program, I had full body aches and pains along with headaches. Increasing my fluids helped. Given your history you may want to start and use lower doses of the Kleritea and the Paranil. Also, you may want to approach cleansing as if you have a chronic disease given your history of severe illness and so you would want to use the Mundipur cleansing from drnatura.com.