Be careful with Triptans. They can definitely cause rebound headaches. Some experts say not more than 2 or 3 a month, some 2 then wait for 5 days before taking more.
As for the warning about no more than 2 in a day, DO heed this warning. Triptans can be dangerous because they constrict the size of your blood vessels and can increase your risk of stroke or heart attack. For example, on a plane I had taken one and thought I was having a heart attack because when the plane took off my blood vessels couldn't expand with the pressure (I had taken an Imitrex just before take off). I was fine because the pressure subsided but if you take too much similar things can happen if have any sort of anomaly in your cardiovascular system.