My daughter complains of headaches.  I know some are allergy related.  She is currently on Allegra (along with the CAH meds) and it seems to help, but we use our share of Sudafed and Tylenol/Advil as well.  I remember reading somewhere that sinus problems are somehow associated with CAH.  It didn't make a lot of sense to me that it would be related and when I mentioned it to the doctor she said there was no link.  I wish I could find the site where I read it.  Anyway, there seems to be lots of "stuff" related to CAH or it seems that way.  With the time of year being big for allergies, I would check that route for the headaches.  Kristin gets a lot of relief from the Allegra.