I’ve suffered migraines on and off since I was a kid.
I can go months to a year without one, or sometimes they get fairly frequent.
I take co.codamol on bad occasions, as for it showing up on any co drug test?..,.I could not give a ■■■■, I ain’t going to suffer all day with migraine, on the off chance that some prick in an office would mistake me for a coke head or something 
, they have been legally prescribed for me, so that’s good enough for me.