I was just thinking back to when this episode started and remembered something.
I was given viagra, cialis and one other one to try while I was on vacation.  Took one of each in three consecutive days. This is when my cycle first started.  
    does't viagra enlarge arteries and viens?
    Is it possible that this could be a huge trigger?
    Has anyone else had any problems using these types of products?
    This is the only thing I can think of that I did different over the last six years.
    Does anyone have any thoughts regarding this?
                                   PF to All
                                        JPC

I dont know about the drugs causing a cycle, but for me they do trigger a CH.  
I took them a few times and each time it was the same thing, I got hit.  Stubborn ones too, that didnt really go away with O2.

Interesting to note that he is saying that the primary mode of action is NOT as a vasoconstrictor but on its effect on the central nervous system. Doesn't change our appreciation of this class of meds but suggests we need to change how we think about the nature of CH.
==============================
Handb Exp Pharmacol. 2007;(177):129-43.  


Serotonin receptor ligands: treatments of acute migraine and cluster headache.

Goadsby PJ.

Institute of Neurology, Queen Square, London WC1N 3BG, UK. peterg@ion.ucl.ac.uk

Fuelled by the development of the serotonin 5-HT(1B/1D) receptor agonists, the triptans, the last 15 years has seen an explosion of interest in the treatment of acute migraine and cluster headache. Sumatriptan was the first of these agonists, and it launched a wave of therapeutic advances. These medicines are effective and safe. Triptans were developed as cranial vasoconstrictors to mimic the desirable effects of serotonin, while avoiding its side-effects. IT HAS SUBSEQUENTLY BEEN SHOWN THAT THE TRIPTANS' MAJOR ACTION IS NEURONAL, WITH BOTH PERIPHERAL AND CENTRAL TRIGEMINAL INHIBITORY EFFECTS, AS WELL AS ACTIONS IN THE THALAMUS AND AT CENTRAL MODULATORY SITES, SUCH AS THE PERIAQUEDUCTAL GREY MATTER. Further refinements may be possible as the 5-HT(1D) and 5-HT(1F) receptor agonists are explored. Serotonin receptor pharmacology has contributed much to the better management of patients with primary headache disorders.

PMID: 17087122 [PubMed]

My last cycle started after taking a Levitra. I awoke in the middle of the night with that feeling that we all know so well. I hadnt had a CH in 4 years. I havent taken another since then.

Patrick

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