I think it's an interesting idea(if you mean doing a story on it, not actually faking a terminal illness IRL). I don't think I can actually help you with beta-ing, because English is my second language and I wouldn't be able to help you as much as someone else might.
I think it'd make an interesting twist if the main character wasn't exactly the most likable person, like if they'd be very ironic and appear to be soul-less, instead of actually helpless and melodramatic(which deep down inside, they still can be, if you catch my drift).
Do you fancy faking a terminal disease? or just doing a project on one? I don't quite understand. Message me, if the second, I'd be interested in helping [:
It's only for a story, I'm not going to fake a serious illness xD
I'm not that stupid.