Only child mum dying of cancer and I’m only 35

This is the exact situation I am in. I could have written this. I’m an only child, 35 in a few months, distant relationship with my dad (alcoholic, emotionally immature, not very kind), I’m unmarried, I don’t have children, my mom is my best friend. I already feel so lonely and have wanted a family of my own so badly. She was diagnosed 2 years ago. She’s 68 and has lung cancer, I think it’s progressed to stage iv now. I feel like we only have one year left. I don’t know how I will go on without her. I am so scared. 

This is the exact situation I am in. I could have written this. I’m an only child, 35 in a few months, distant relationship with my dad (alcoholic, emotionally immature, not very kind), I’m unmarried, I don’t have children, my mom is my best friend. She’s 68 and has lung cancer. I think we only have one year left. I don’t know how I will go on without her. I am so scared.