I don't know about the fever but the headache are from the die off. Drink more water because you are detoxing. Keep your Bm's moving.
Look up at the top of this page and click on Clark. Then click on Liver Flush.
Hulda Clark says in her book that once you get out so many Gullstones and chaff then your allergies will start disappearing. My girlfriend could never eat garlic, it made her sick to her stomach. She has done 4 liver Flushes and now she can eat garlic without feeling ill. Her liver count went from high to normal also, if you have been following my posts on her progress you can see. Her Doctor want all the information on what she has been doing because she wants to get her patients on it. My girlfriend has a good doctor! Donna