After suffering from a gripping one-sided headache for over a year (and being mis-diagnosed with migraines, paroxsysmal hemicrania, depression and more) I finally found relief through physical therapy.
My headaches were caused from a few of the vertebrae in my neck which were locked and pinching the nerves and blood flow to my head and giving me the headache. After a lot of pain, heartache, medication, side-effects, lost productivity, and even suicidal thoughts, the simplest form of treatment got rid of the headaches and gave me my life back. Please consider investigating this through a simple physical examination of your neck and shoulders. I hope this info helps someone out there!