How to not dwell on the inevitable?

My husband and i are born again christians both saved this year and we're closer than ever and just loving life with our family. My struggle is that i'm so grateful for our lives with our kids that i'm irrationally afraid of death right now or of anything happening to us. i've always struggled with the fear but could shake it off but it's crippling me to where i'm so on edge every day of losing a piece of my wonderful life and family and i need prayers and advice and scripture to help me move past this.