recovering from stroke

why hasn't god miraculously cure him?, what is missing? what do i have to do for allah to grant back my physical ability. it is said in surah yasin that god is all powerful and can do anything:- kun fayakun- and i have read elsewhere that ALLAH is always around you and he knows what lies in the deepest recess of every heart of every being, but why has he not grant my doa/ pleadings what is it that i need to do?i feel that iam almost there- syukur alhamdulillah- and that all i need is that little nudge from god, ya allah ampunilah dosa dosaku.i accept my affliction, it is a punishment for all my excesses, a gentle reminder, and i am so very grateful,god could have just ended it all for me, but no! i now have another chance to lead my life the righteous way, but god please let me have back my physical ability to live normally and more meaningful.