Anyone had any experience with a Cluster cycle irrupting after missing a dose of Verapamil? I am generally very careful to always take my verapamil and always around the same time each evening. Thursday night I missed a Dose and I’ve been in a perpetual state of CH shadows for days with Nocturnal Attacks every night now for 3 nights....it’s sucks. I’ve been almost headache free for several months other than an occasional headache that I’ve been able to abort with O2.