I awake at night several times a week with a severe headache and can hear a loud swooshing sound in my head. When I close my eyes tightly the sound slightly diminishes each time I close my eyes until it is a mild swooshing sound. I have had an MRI and they said they could see nothing wrong. The headaches are so severe they wake me from a deep sleep. I am at a loss. Anyone experience something similar or have a clue what could be happening to me?