MJ, look how many years you've been around the cats-don't you think that if you were allergic something would've shown up a long time ago? I'm no doctor, but I'm gonna guess that your headaches are from something else-you on a new med, change of dose, more stress, fever, etc. Don't let the doctor blame this on allergies without checking out other causes. If it does wind up diagnosed as allergies, there's lots of good meds out there.