Cyclical spiking fevers for toddlers

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Hi. Has anyone had experience with their toddler getting cyclical spiking

fevers? My DS has been having this problem for quite a while now and we think it

is due to food sensitivity of some kind but don't know. They'll go as high as

105 and don't respond much to fever meds and many times have had to go to the

ER. DS seems to have phenol issues, maybe salicylates, so he's on the Feingold

program and also dairy and gluten free. Still having issues though. Any ideas

would help. Is the fevers thing related to yeast, bacteria....anything else I

don't realize? Thanks