I have a fear of dying...Can you relate?

I am young, have a chronic condition that can lead to life threatening complications (type 1 diabetic) and suffer from depression and pain. I have a major fear of dying. It seems to overtake my life a times. I'm not sure why this is but I live in fear. I know that no body knows what happens when we die...but I'm afraid of the unknown and it's making it hard to live. I often wonder why we are all here on earth and how we got here...I try to have faith but I still fear...Can you relate?