Fucking Cancer

Four months of chemo and two bone marrow transplants later, my mom's cancer has rebounded. To be accurate, there was an intermittent year and a half when she approximated being disease-free. But all factors considered, including my moving home for 15 months to help out, the entire process didn't afford her nearly enough time or benefit. And the selfish part of me wonders how her resuming treatment is going to affect me - I just enrolled in a weekend writing class. How does one manage work and outside interests with family situations? How do people decide between putting their family or themselves first? And how do they quell the guilt that accompanies choosing the latter?