Scared of death.

Ive never really openly talked about it but I am so scared of death... I don’t even get to be happy, ever because I always feel like something is going to happen to me or a loved one.. please tell me ways to get over that? I struggle everyday with this... I have a two year old son and I just watched a video on a boy dying from cancer and I’m literally a nervous wreck... I am so scared to lose him and people in my family and myself... please help or suggest stress free things