I myself was in same kind of situation about 7 years ago. my father is alright right now. his heart by-pass surgery went very well. AlhumduLillah.
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always try to recite Ayat ul Kursi til “hum fi ha khalidoon” (3 ayats).
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if you believe in read Nad-e-Ali (AS)- that is the best. link here as follows
http://smma59.files.wordpress.com/2008/10/naadealiasresizedbe5.jpg -
if possible for you make (do) a Manat that you will goto visit (ziaarat) of Imam Raza (AS) in Iran.
(4) i am posting the following Dua for your father and for yourself. recite as instructed.
I will pray for you and your father - InsShaAllah (bay Haq-e-Muhammad wa Aal E Muhammad (PBUH) he will home pretty soon.
wasaalam.