What Causes Recurring Headaches?

I have recently had unusually painful, sporadic headaches, but have no history if migraines or headaches. These headaches jave occured over a two month period. More recently, symptoms include sensitivity to light and noise. They are isolated to the left side of my head, and a particular spot. I have tinnitus in my left ear frequently, and my ear feels full of water. I have eye pain occasionally in the left eye. All pain and symptoms are isolated to the left side of my head. I do not have health insurance, and wish to gain some idea of what could be wrong without unnecessary testing. I have had a recent head injury within the last two weeks, and a CT scan result was negative for any abnormalities, but I still have symptoms. As of this week, I was diagnosed with Strep throat and after two separate treatments/prescriptions of antibiotics, I finally gained relief from the strep. During the strep episode, my headaches were extremely unbearable, and woke me up during the night They never even suggested a spinal tap, and my concern was meningitis. Please help me gain perspective and get some possible answers or suggestions toward my symptoms.