Re: 15 month old son and fever
Yes, the fever will go away within a few more days at the most. According to my mother, I ran a high fever for 3 days after my shots, too. Keep dosing with Motrin and Tylenol, keep monitoring his temperature, and call the doctor again if it goes much over 104, lasts more than a week, or if he vomits repeatedly and has trouble keeping down liquids.
Febrile seizures are scary, but usually not harmful or serious in the long run. Until he reaches school age, just watch him when he gets a fever.