Greetings fellow Cluster Heads.
This is my 7th year dealing with the monster.  Always toward the beginning of spring.  This time however I spoke to my pharmacist and explained the symptoms prior to the attacks.  Probably more fortunate than most, my attacks come in the evening, once a day and always at the same time.  This year, at around 8.30pm. I had suffered 2 prior attacks the provious 2 nights. The chemist suggested I try an antihistamine as a preventative.  I took home a packet of Phenergan 25mg (active ingredient Promethazine hydrachloride) a medication usually used for hayfever sufferers.  I took 1 tab that night at 7.30pm an hour before the expected onset and another at 8.30pm when the attack usually comes.  The result......... I was a blathering fool, very drowsy ( but maybe that was also due to the wine I had consumed) but the upshot is that there was no attack that evening.  It has been 5 nights now and following the same procedure, I have managed to stay pain free.
To answer the anticipated questions.......YES I have been dignosed as a Cluster Head........YES I understand that is early days yet, but for the time being it appears to be working........ NO I dont condone taking medication with alcohol, but I enjoy my wine.  YES I am not much use for anything else at night (much to my wifes disappointment) but for the time being I am pain free and that all I care about at this time.
I just hope it works for others
Best of luck Comrades.

I'm so glad you found something so straightforward to work for you! 

For some, there is certainly a reason they used to be called "Histamine headaches."   

Best wishes and hopes that it keeps working for you!

Laurie