I have walked where you are walking and lived what you are living. The pain never goes away but you will learn to live with it. You must relish the time you had together with an emphasis on the good. She lives on in your heart and your mind, thus she is never really gone.
Draw comfort from those around you and let them help carry your burden as you would help carry theirs. And believe in your heart that someday you and she will be together again.