Im wondering if this is causing me to have a rebound headache and what are the risks, googling is ominous. My doctor simply said "take one as soon as you feel the onset of a tension headache" Tension headaches and migraines are actually pretty new for me. I had my first occular migraine which sent me to the ER because I honestly thought I was dieing or having a stroke or something like 7 months ago, since then ive had 1 other full blown going blind terror train. Although I havnt had many of the terrifying puke now ones, I have been having many rubberband around my head, sick to my stomach, tension in my neck ones which ive been taking the fioricet for. I'm just scared that with such a lengthy halflife of 35 hours that I may now be having rebound headaches from all the fioricet. What should I do? And what should my precautions be in the future to perhaps prevent it.