My mom is dying and I'm scared?

I'm 14 and mom is really sick with stomach cancer. The doctors have put her in hospice and said she doesn't have much time left. I'm taking it really hard. Me and my mom never had a good bond. Im the middle child so we argued a lot. I have so much regret. I haven't told anybody about it. It hurts too bad. I don't have a dad (he walked out on us) which means I don't know where I would live. I'm really scared. What should I do? How do I tell people or talk about it when the impossible does happen? How do I not have all this regret? How do I live without a mom? :'(