My worse nightmare

I had the most terrible dream last night. The scary thing was that it felt so real, and that it could definitely happen very soon. In the dream, I got a call from my mom telling me that my grandpa and grandma had died. I remember the feeling of hopelessness I felt at that moment, and how it felt like my heart had been ripped into pieces. Then my mom told me that my grandma wasn't officially "dead", but she was brain dead and in a coma. At that moment I remember feeling a tiny bit of hope again, but then a feeling of dread followed. It was the worse feeling in the world. I don't know what would happen to me when my grandparents really do die. I feel like I would cry forever and I would never be happy again.