Welcome to healthcare magic.I would like to know, if that episode was fever
or a siezure/ convulsion
. Was there any rigidity of the hands of limbs
, did you notice any kind of uprolling of eyes, any disfigurement of face or involuntary micturition/defecation during any of the spells of which you have mentioned, he had had during his life.From the kind of history you have given, suggests more of a siezure.Had he underwent any investigations.A complete blood count
,rule out the infectious diseases common in your locality,an ECG, an EEG as well.You need to go to a medical physician, and get an elaborate checkup, as there could be much beyond what you see as chills which can be very well treated.