Fear of loss

I always have those ideas of what if i lose someone i love , used to ignore them and just enjoy that things are going fine till the day i knew that my dad is sick and he had to go through many operations , it was like all my fears are awake at once. Fear of loss , fear of being alone , he is my everything can’t see him in pain can’t see him sad and am just standing there helpless!! It hurts me so much when it comes to people i do love them . Can’t accept the idea of loss .. can’t accept that it is all gonna change and gone also it affects me when it comes to marriage and having a family .. i don’t want to repeat the circle repeat the pain by getting attached to people