I wake up almost every morning with a headache on the right side of my forehead and in my right eye..down ear and neck sometimes. what are the causes?

AM headaches: it sounds like your are grinding of your teeth in your sleep resulting in TMJ Syndrom . you may want to consider an over-the-counter mouth guards and see how that will works for you. If that works then you can go see your dentist to make one for you. You may use a mild muscle relaxant at bedtime (from your PCP). Use ibuprofen for pain. Best wishes