I would also like to add my 2 cents worth ( I think I have already put in many dollars .. sorry and thanks for listening  )  In a study that's posted on another topic here Clusters were recreated by having participants inhale Nitro Glycerin. This indicated to me that something causing inflammation in the sinus cavitiy stimulates the Sphenopalatine ganglion or the Nasociliary ganglion causing inflammation and hence CH's or an otherwise like condition called Charlin's syndrome (you can google this).  I believe that the CH or Charlins brought upon an hour or so after sleeping might indicate acid reflux upon reclining reaching the back of the throat causing this inflammation.  I also belive the the seasonal CH's experienced while awake are caused by the inhalation of whatever grows in a specific area at that time of year and an allergic reaction to it.  My son rarely gets a CH when awake. Almost always they come 1 - 1.5 hours after laying down.  I am going to however have his blood serum testing for possible allergies  (also note along with the reflux/headaches for him comes much Hay Fever and sneezing).  I am continually reading trying to look at all symptoms until it all comes together and makes some kind of sense.. thanks for listening !! again

didgens wrote on Aug 15^th, 2014 at 11:54am:

You could try a high quality magnesium supplement like this instead of the aluminum-containing Mylanta...
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I was wondering about this for quite some time.

Interesting, after a 1 year cycle I had an ulkus perforation and immediately became completely pain free for around 4 months. Then the headaches returned.

About 4-5 years ago during one of my cycles, I noticed that whenever I took an antacid at night, I didn't get an attack the next morning. I was convinced that I had found the cure and sailed through that particular cycle smoothly. Only for the beast to have 'adapted' and return 6 months later with antacids having no effect.  PS - I was using an antacid syrup containing Aluminium Hydroxide (no magnesium in it as far as i can remember) and omeprazole 20 mg, about an hour before going to bed.

This is really interesting. My neuro asked me if I have acid reflux (I do, but not badly),  and I was puzzled but I didn't think to ask what the connection was.

chronic gastritis for years.

I am convinced that there is some relationship between acidity levels and primary headaches.

Diet, water, smoking, coffee, fat, processed food.

I live in China and if you go to a TCM doctor they will tell you that they treat headaches as a stomach ailment. Maybe they have a point after all.