I have been getting clusters on a roughly 2 year cycle for the past 15 years. The cycles last about 5 weeks. The starting month is a moving target. The last cycle was Nov 2017 after a Nov 2015 cycle and a Sept 2013 before that, but this one is April 2020. I try to not take drugs if possible, but it becomes too unbearable at times. The past 3 cycles, I’ve been using the Sumatriptan nasal spray. I probably wait too long to take it because I really only want to do it if necessary, but then I deal w/ a monster headache. I find that no 2 clusters are the same (pain or length). Unfortunately, while the time between cycles has been somewhat consistent, as have the cycle times, the severity and frequency during the cycles is getting worse. Alcohol is 100% a trigger for me and has always been. I am starting to find working out and being hot under a blanket are also triggers. Anyway, to get to the point, I started taking 240mg of verapamil 2 days ago. I can let you know how it goes.