i am the same as your friend rowan...good days and bad days...walking for even a small distance can putr me in serious pain and i am in pain for days - and each time i am permanently ruining my spine and hips...plus i have asthma which adds to it, so sometimes i feel i would need a badge, other days i am ok
i think one of the biggest problems here is the choice of logo - the wheelchair - i think it is this that angers ignorant people as they misunderstand its use... they think it is only for someone in a chair or with a stick or something ... because it makes no obvious connection to others ailments people dont realise that it covers a multitude
my friend had a brain haemorrhage and looks totally fine and is young and get some stick for it...however she gets very unstable, tired and dizzy and has to hang onto people as much as possible.
I haver considered applying for a badge, to use only on occasions when i am bad, or for work, to help me get by, as i struggle with carrying things...