Four years ago today

I was told by a doctor that I should be dead.

I was told that I should be happy because this means I beat the odds for another year, but its just so hard.  My medical issues have been such a rollercoaster lately.  I am starting to really get worried that I might not be able to beat the odds for much longer and it may be my time.

Yesterday I was told that one of my cousins who has some similar medical problems has cancer.  I had a biospy which came up negative but earlier this year the doctor told me that I was looking at another go around next year. 

Yeah I have made it another year. 
 

But how many more are there for me?