Vitamin d3 regimen in General Board Posted August 13 · Report reply It really sounds like what Freud said, hemicrania continua: https://www.ninds.nih.gov/Disorders/All-Disorders/Hemicrania-Continua-Information-Page You'll see on this page that if it is HC, it is treatable with a medication, indomethacin (and cluster headache treatments, such as oxygen, are likely not to be effective). It's relatively easy to test with indomethacin whether it's HC or not, though it is not beyond doctors to screw that up with not prescribing enough or not long enough. Indomethacin is hard on the guts, so it needs to be taken with something to protect your stomach. You can start the D3 regimen without a blood test. It's 99% likely that your D level is low. I don't know whether the D3 regimen helps with hemicranias or not. CH is somewhat genetic, in that it can run in families, but most people who have it do not have a family history.