Hi,
How are you? Was there a previous trauma to your head and neck? It would also help to know the tests and work-up done. If medical management do not help, you may benefit from complementary and alternative medicine such as biofeedback and self-hypnosis. This has helped some patients. Take care and do keep us posted.
sounds like you might have status migrainous. It's similar to chronic daily headache, only w/ a migraine that never goes away. I've been suffering with it for 8+ years, since I was 13. (Man, that's depressing to think about)
It's basically a chronic condition that you just "get" to live with as far as I've been able to find out. You can treat it, but not cure it.
http://www.*************.com/migraine/types-of-headaches-39093-5.html gives you the basics.
Sorry to hear that you might have it, but know that you're not alone.
~Dame