In December I had very bad cold and ENT specialist diagnosed it as sinus . I use to have very bad headache on my left side of head while lying down. Now again since last one month I am having strange headache on left side of my head while lying down with pain in my ears sometimes. One or twice the headache was so severe that I couldn t sleep whole night . I have shown myself to a physician he said it is trignminal neurologia . He sent me to a dentist before getting a CT scan done. Dentist said one of my tooth is having wrong filling on my left side which needs root canal to be done . Now the orthodentist is doing root canal of my that tooth. I often use to feel sensitivity on left side of my teeth but no pain in that tooth. Since last two days again I am having headache . I have eaten enough of pain killers can u diagnose what it is?