I have asked the same question my self. I have a list like you of the people I love who has passed away now, I am facing my father who has brain cancer.
All I know is some how some way all this is suppose to make us stronger people. However it is hard to imagine how. One thing I have learned that has helped I have chosen my pictures what I mean is, I pictures posted of the ones I love of them being happy or smileing so, I can look at them and remember them that way and not the way they were when they died.
It is OK to be angery, it is ok to cry. just so you know all your emoitions you are feeling are normal even if they don't feel right. I feel for you, I understand your pain and most of all I ask the same question all the time why is this happening. All I can figure out is that God has chosen people like me and you and others out there because his a big plan for us.

I will keep you in my prayers and keep us posted on how you are.