The headaches began in March. The couple didn’t think much of them — until Carrie DeKlyen began vomiting. An initial scan showed a mass in her brain. More tests showed that it was a form of cancer, possibly lymphoma, but treatable. But a pathology exam revealed a more grim diagnosis. The 37-year-old mother of five from Wyoming, Michigan, had glioblastoma, an aggressive form of brain cancer.