I wanted to share my story in case it may help anyone.  My CH’s started when I was in my early 20’s and I would get them every two years.  They would come in June and normally last about 3 months.  About 10 years ago, they stopped and I did not get them again until now.  I’m 48 years old now and I started back with clusters again on June 22, 2016.  Maybe it was the shock of them coming back or the fact that when I was originally getting them there wasn’t really anything that could help but I waited until July 19th before looking into getting something to help me.  I called a few headache clinics in my area but no one could see me for over a month, so I decided to make an appointment with my regular doctor.  After talking with her I got her to prescribe a round of steroids and she also gave me rapid melt Sumatriptan pills.  Neither of which worked.  By this time I was getting 3 to 4 cluster headaches a night.  They would last between 45 minutes to an hour and a half.  The worst was that I was having all day long shadows which would not go away.  On July 24th, I went to Urgent Care but they could not really do anything since they cannot prescribe any time of preventative medication.  On July 25th, I started the Vitamin D Regimen.
On July 26th, I went to see a Neurologist who prescribed Imitrex injections and Verapamil.   I got the prescriptions filled and took a Verapamil that night, I was also remaining on the D3 Regimen.  Got one major CH that night and took the Imitrex injection which aborted the CH within less than a minute.  Three more headaches that night which were less intense, so I rode them out without using anything.
On July 27th,  I took 1 Verapamil in the morning and another when I got home from work and also took the D3 plus co-factors but decided to take 30,000 mg instead of 20,000 mg.  That night, no headaches!
So I wondered, does Verapamil get into your system that quickly?  I didn’t think so.  I continued to take both Verapamil and D3 for the next few days basically out of fear that the CH’s would come back.  On July 31st I went with my gut feeling that it was the D3 that was helping and not the Verapamil and went off of the prescription.  I continued to take the D3 and have been following Batch’s 4 week regimen.  No headaches!  I am in awe that something as simple as this has worked.  I can definitely tell though that I’m not out of this cycle.  I can feel pressure sometimes where if I wasn’t taking the D3, they would definitely return. 
So I just wanted to share my story in hopes that someone new coming to the site will try the D3.  I know that it was my saving grace!   

Thanks Thierry!  Thank God for this forum.   I don't like taking medication if I don't have to, so the fact that vitamins are helping me is awesome.  It's just sad that doctors want to just prescribe something and that they look at you like you are crazy when you say that there is a vitamin regimen out there that works.

Hi Peter, D3 is definitely part of my life now!  Glad I brightened up your day! 

Jackie