Extremely scared of death of fam. Fear?

I lost my uncles to cancer v suddenly 5 yrs back, since then i have become extremely scared of family member's death. I was away from home and got nightmares of that. 1 year back i lost my grand father whom i was close to - unable to get over that. All the more scared of losing parents, sis, husband. I stay away from family in another city with husband, I don't feel at ease here. I constantly want to go home and stay with parents too. I feel i m losing out on my days with family. Extremely scared of their death. I get random v scary thoughts of that. I don't think i can survive after parents death. I feel i can never be what i was after my grand dad passed away, now if and when i lose my parents i will sink. How to win over these thoughts of extreme fear? I keep imagining random scenarios of death of family members and get scared. I feel life will lose all meaning if I don't have my family.