Nerological issue

Patient: I have been having alot of pain in the left side of my head (just a small spot not the whole right side) for about 6 months now i have been for 1 CAT scan and my family doc thinks i just have hypertension in my head in neck. however the pain is always there, it starts in my head and affects my left side sometimes its so bad i will lose balance on that side. i think something else may be wrong and i am looking for a second opinion on this . thanks