migraine
"I started having migraines after the birth of my second child.  At first I was able to tolerate them, then I started treated them with Extra Strength Tylenol then Excedrin PM.  They progressively got worst.  This was the 4th medication my primary doctor prescribed and they really helped but my neurologist said 70% of patients suffer rebound headaches from it.  He said to use it occasionally (3-6 times/year).  Now I'm on preventive medication (daily dosages) with this as a back-up when a severe migraine hits."