Just a thought but have you had an MRI w/& w/o contrast? I have what is known as Cavernous Angiomas of the brain. I have constant, daily migraine like pain in my head. Some days greater than others (esp when i have an active bleed) it will not show up in a regular MRI. They must use a contrast medium to see the bleeds. Check w/a neurologist on this if you haven't already. Good luck & God Bless.