Cerebral palsy and stomach cancer diagnosis

My bother has cerebral palsy, non verbal and has 24 hour care.  I knew his life expectancy was 50.  He had stage 2 testicular cancer last year and following a recent scan they discovered a mass in his stomach.  Doing some research on here I found out that it’s quite common, to get an additional cancer.  However, my brothers complex needs I thought it would be tricky but he’d come through.

today the consultant gave him 6-12 months and recommended palliative care, as the treatment would further complicate his current condition.

I’m the only other sibling and I’m totally numb from the news.  We’ve always been close and I often looked after him when mom and dad needed an hours break.  Seems silly me saying this but even with his life expectancy I thought I’d have more time.  I feel guilt as he doesn’t know that he’s been given this…well death sentence.  I don’t know if I’m angry, want a second opinion or what…. mom and dad are broken and I’m trying hard to be strong…they don’t need me creating issues….. feeling devastated and lost.