I'm scared to go to sleep after the nightmare I had last night. How can I make sure I don't dream it again?

My grandma died two years ago and I often dream about her. But last night I had a really bad nightmare about her. We were out shopping when she suddenly died. The next thing I remember is her lying on a bed in the shopping mall and she looked exactly like she did in her coffin. Then I looked over and saw a hole in the wall where they kept all rotting corpses who had died in the mall and they were putting my grandma in there. I woke up there with tears in my eyes and now I'm terrified to go to sleep tonight incase I dream it again. It really was horrific. Will I?