The MiBlock app is a headache diary created for participants in the MiBlock study - a treatment study on chronic migraine. The MiBlock study is a treatment study on treatment-resistant chronic migraine, where we test for blockade against ganglion sphenopalatinum. This headache diary should make participation in the study, with daily reporting of headache status and related conditions, as practical as possible for study participants. The app has an alarm feature so you can get reminders to fill