PCB, I am so sorry that you have to experience this loss in your family. I understand your thoughts and feelings of dispair, but I think your uncle would not want his death to also take away your own zest for life. Yes, you will miss him and grieve for him, that is as it should be, but you should also try to think about the things he held in high regard and find how they can translate into your own life.
The fact that your uncle had a condition that caused a heart attack at an early age is something that your family may need to take into consideration when it comes to being aware of dietary and lifestyle choices. I say that in an attempt to find some sense of direction in this very sad, tragic loss.
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