. . "problems, such as balance issues, numbness and tingling, memory loss, paralysis, slurred or garbled speech, or inability to speakProjectile vomitingSeizure or convulsionStiff neckSudden changes or problems with visionWorst headache of your lifeSymptoms that might indicate a serious or life-threatening condition in infants or toddlers include:Abnormal pupil size or nonreactivity to lightBulging of" . . . .