Grade 2 astrocytoma (infiltrating) low-grade glioma

I am a 53 year old wife and mother to 3 kids, 22, 17 and 15 years old.  I was diagnosed 3 months ago with a grade 2 astrocytoma (infilitrating), low-grade glioma, 3 distinct areas, lesion multifocal right frontal lobe 2.2 x 2.7 cm, rare scattered positivity for EGFR and p53, single mitotic figure was observed, diffuse atypical astrocytes noted in the specimen.  I had a biopsy done shortly thereafter and my neurosurgeon confirmed everything from his first diagnoses from my MRI.  I have elected to wait and have radiation done when needed because I am leading a somewhat normal and healthy life. I don't believe normal will ever be the description of my life again.  There are so many limitations such as travelling outside of Canada, because of obtaining insurance, making long term plans such as renovations, seeing a future with your children such as marriage and grandchildren.  Now, I can't seem to understand how a person is suppose to carry on and stay positive from day to day with such a nightmare to have been placed upon me and my family?   Why can't the cyberknife be used to try to remove the tumour?