I am so sorry, D Kane.  
I feel extremely dumb, staring here for I don't know how long, trying to think of something proper and meaningful to say.  The only thing I can say for now is that we will be here for you.  
Do you happen to have extended family nearby?
When I was younger, just having turned 11 years old, my baby sister died from a heart problem that she was born with.  
I have one brother, and if he died, I don't know what I would be like.  I cannot imagine what you are feeling right now.