Panic attack about death

I am very scared to die I often everyday have at least one panic attack about death and the after life I am so scared that I even exist it freaks me out. I have two children and I feel like a bad mom because one day they will have to live without me being here for them and also I feel bad because one day they have to die too. I am so scared of death. I fear oblivion and never coming back someone please help?! How do you cope with death?! I am terrified 😭😭