The better question is how is your quality of life in terms of mobility & cognitive function? What can't you do after the treatment? Now what can you do after the treatment?
I suggest that you look at David Bailey's web site, he was diagnosed with a Glioblastoma Multiform grade IV - (there is no higher grade than 4) and given 6 months to live. He survived 14 years
Even your medical team cannot know for certain.
Did they place a permanent shunt in your brain to drain the excess fluid?