I get fevers when I have some sort of infection. My temps have gotten really high then go back down. When I first really started a flare it went up as high as 103 then would go back down with tylenol then back up, etc until finally the fever broke after a few days. i went to the dr in the meantime. i don't think i was eating much those few days, maybe just gatorade (bad idea with all the sugar for me) and brown rice.
hope you are doing okay!