Totally heartbroken

Last night I found out that my mum has cervical cancer. She's had it before but now it's worse. She wanted me and her to go and drive somewhere and gas ourselves because we both suffer from a chemical inbalence in our brain which makes us not very well from time to time. I managed to pull her back, she's not as bad today but I can't get it out of my head. I'm so heartbroken. I know if she goes then I will want to go with her.