A frequent flyer is a person who has visited the ER instead of going to an MD's office for any ailment that is non-emergent. He may have visited more than one ER (ie, "the other hospital gives out cab tickets and meals"), or his doctor may have made an appointment for him in the next day or so, but they can't wait (the instant gratification type).
In your case, if you are truly doing everything you can to PREVENT a headache, and you understand that the ER is only a temporary solution for a chronic problem, most ER nurses and docs will not label you a FF or drug seeker. By the way, narcs only exacerbate your problem. Did you know that?