fear of losing dear ones. how do i come out of it?

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i recently lost my favourite pet. and i haven't been able to digest the fact that my doggie is no more in the world. i think i've developed a phobia with in myself to raise another pet in my family.i can't afford to lose anything more in my life and i started rejecting everything that comes close to my life. how can i come out of this situation? can anyone help me.