I am experiencing a sharp stabbing pain on the left side of my head and behind my eye that last for a few seconds and then goes away. what should i do?

Left side head pain: One sided head pain behind one's eye could be migraine. But you should see a physician and get a medical diagnosis as it could be a medical condition that requires treatment or further diagnostic evaluation. If it is migraine, stress management therapy, biofeedback and/or medication are treatment possibilities.

CPH: Chronic paroxysmal hemicrania. It is appropriate to identify or exclude any secondary cause for the headache using blood chemistry tests and brain imaging procedures. However, almost all cases of cph are relieved by Indomethacin (indocin) and this response is considered diagnostic for cph. Rec.: see orofacial pain or headache specialist.