I was actively driving my 2015 Jeep Grand Cherokee with my 3 year old son in his car seat in the rear passenger seat when I was violently struck in the back of the head causing me to momentarily black out. I came to confused and assuming i was rear ended by another vehicle, i immediately pulled my vehicle over to check on my son, when i looked back i noticed there was no one behind me. When i got out of the car I began dry heaving and felt extremely nauseated. i checked on my son who seemed ok and on the back of my vehicle which was in perfect condition. I was still very confused and checked on my son again who was crying and scared because " mama was hurt", its at that time that i notice my driver side head rest had exploded. it was completely split in half. my active driver head restraint that is built into the head rest had gone off for no reason. An hour after being struck in the head I was till experiencing nausea, pressure in my head, head ache, neck and back pain and dry heaving. because I'm also pregnant my husband drove me to urgent care. they said i had whip lash and likely a concussion but because I'm pregnant there wasn't much the could do for me without risk to the baby. Because this happened after service hours at Jeep I called the the next morning where they advised me there are no recalls on my jeep and no warranty on the head rest. I will need to pay for it to be looked at and pay for any parts necessary to repair it.