@cma1219 Elite colleges, in fact all colleges, are looking for evidence of raw brainpower and sufficient preparation to thrive in a highly competitive academic environment. In addition they’re looking for students who have shown they’re likely to make an impact on the world through focused academic drive and/or special skills.
As others have indicated, overcoming a devastating condition, as difficult and praiseworthy as it might be, is not enough to prove these things.
I would suggest you look at some of the results threads on the Ivy League forums. You’ll see that these schools turn down tens of thousands of students with virtually perfect records. What do you think you offer that would lead admissions to offer you a place over some of these other students?
Have you looked at options within your own country? If not, why not?