My Face Swells And My Right Head Pain. What Can This Be?

two years back, i felt a shock like feeling in my right face when i was sleeping, i woke up and looked at my right face it was swollen, and became numb, and little burning effect around my right mouth which last for 2 to 3 weeks then it decreased little. and there was a sharp pain in my right head . I consulted a doctor and took a scan of my head. there was nothing shown in my scan report. For the last one year the pain radiated from head to shoulder and through out the right body. Again i have taken a scan, found nothing. The Dr told me that it is a psychological problem, presently i m taking maxgalin 75 mg and dezella 20 mg. But still i hope that it is not a psychological problem. waiting for your reply.