I Am Afraid of My Loved Ones Dying

It's been almost an hour since I received the news of my grandma about her health. My family and I have known few months ago her health has gotten worst and the doctor said she has maximum 6 months left to live because parts of her body has stopped functioning due to sickness and old age.
Now, when I receive the news about my grandma that instead being rushed to the hospital, (she's been confined in the hospital back and forth these past few months), my family back in my birth city called a priest to pray for my grandma and for my family to ask forgiveness. The priest told my family that the soul of my grandma has left the body already. My grandma has stopped eating today and she's just sleeping the entire day.
When I heard the news, I have thought I already accepted the fact that she will leave us soon.. I never thought it would be hard for me to accept that she's dying.. I cannot seem to let go of her for now but I needed to be strong for my nephews and nieces who adore their Great grandmother so much.

I thought I'm not afraid already to lose someone that I love and adore so dearly. I have already lost two person in my life, my dad and my cousin, however it seems that I'm still afraid.