Fear

I was wondering if this was normal. I had depression for years but now that I have a son. I would like to live long enough to see him having a good life. But i have this constant fear of death (not for me) I'm scared of seeing my son die. I often think about the revelation from the bible. And if that happens and i see my sons dying that its hell for me. Araw araw ko to iniisip. Is this normal? Should i seek professional help? Minsan my heart races sa sobrang pag iisip tapos naiiyak nalang ako. Mahal na mahal ko anak ko and the thought of him hurting doesnt only kill me. It's like torture. Help