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Severe pain behind the ear might be indicative for pathology in the ear such as an ear abscess (mastoiditis) or it may due to some pathology in the head. I would advise that you seek urgent opinion of doctor/ENT to confirm the diagnosis.
An ear abscess is usually caused by bacteria and needs immediate medical attention to avoid complications. Te symptoms include severe throbbing pain, bleeding or discharge of pus from the ear and swelling and redness in and around the ear. The treatment includes a course of antibiotics and warm compresses held against the ear to ease the discomfort.
Take care