Woke up with pain on the left side of my head but thought it might be a sinus headache some pain in my ear some pressure of my jaw/cheek, came to lay down on opposite side. The pain does seem to be subsiding. It's odd I don't have any postnasal drip per se, I don't have any allergies or anything like that, but it was a very severe pain behind my eyes, jaw, cheek and ear. Also my headaches are always on my left side. Could it just be sinus trouble?