My cats are dying!

We have two indoor and two outdoor cats. I purchased Hatz flea collars and put them on the indoor cats about two months ago. The cats are getting sicker and sicker. they can not keep down any foods and are vomiting every time they eat. We have wormed them, given hairball treatments all to no avail. I took the flea collars off two nights ago and one cat is now able to eat without vomiting and the other is keeping the food down longer.
Have you heard of this as a reaction to Hartz flea collars???

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