What makes you think your allergies will go away? Some people have experienced allergy relief as a result of cutting out toxins (people sensitive/allergic to wheat, dairy, soy, corn, legumes etc.), but if your allergies are seasonal, you will likely always experience them. I stick with a daily Zyrtec as mine have not changed any, but am taking 1 tsp of raw local honey every day to see if my body can acclimate to the local pollens. The constant post nasal drip is what bothers me the most.
I would suggest you try out some OTC allergy meds to see if those help your exhaustion and look into whether your insurance covers allergy shots/treatment.
And to clarify, if you got rid of all the fat on your body, you'd die!