how to get rid of quilty feeling?

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My father already passed away 2 years ago...i love my father so much, he's my everything....he sacrified alot for me, always give the best for me. My father passsed away because of heart attack. At that time, doctor already recommended my father for a surgery....but my father didnt want a surgery because first we r not from rich family and dont hv money for the surgery. i just wish at that time i had money to help my father....but too sad that i didnt hv money also then my father passed away....until now i still have a quilty feeling for not helping him..i know no body blames me or what, but it's just that i feel i didnt do my best for my father....what should i do ?