The left top side of my head feels numb after the numb feeling goes away my head hurt on that side what could be the cause?

Could be migraine: which often causes headache on only one side of your head and can be preceded by a numb feeling or other aura. For more information see: http://understandingmigraine.blogspot.com/

Most likely migraine: Migraine is a type of headache resulting from imbalance of brain chemicals, especially serotonin. While sensitivity to light, nausea, vomiting, flashing lights are common symptoms, numbness can be a precursor symptom. Especially in women, hormone changes associated with menses can trigger. You need to be evaluated by your doctor; effective treatments are available and other causes need excluding.