I have chronic migraines, and think i might also be having rebound has from advil (ibuprofen). if i stop taking it, how long should it take for the has to go away?

May not work: You likely have chronic daily headache patterns, and could well be prompted by your advil (ibuprofen) usage, which is not uncommon, but your Fioricet will make this even worse, and Amitriptyline will be unlikely to break up this headache pattern. In short, see a neurologist who specializes in headaches, and get your med program totally revamped. Might also check in with dentist re teeth and/or jaw issues.