[Shprrrrt]

Cluster Headache (CH) is also known as the Killer headache, because of the high prevalence of suicide in suffers.

Methadone has also recently been demonstrated to be an efficient CH treatment, and it can legally be prescribed (though I would recommend it only for medically intractable CH, i.e. CH resistant to the usual prophylactic treatments like Verapamil and Lithium salts).

Occipital nerve (electro)stimulation is also an effective treatment in ~75% of intractable chronic CH patients (almost daily attacks all the year without remission). We're currently trying to get the surgical procedure reimbursed by the social security in the European Union.