@Dateless No. I would say to make the best of the life you have remaining. Everyone is going to die. A diagnosis like that just gives you an idea of when. Definitely take some time to grieve, but try not to die before you're dead. There is a difference between communicating your problems and letting your problems own you.
I had stage 3 bone cancer. I'll grant that brain cancer is more scary, but the shock value of such things has been lessened for me. Not everyone survives as I have. I still have to go in for frequent screenings for the rest of my life to make sure it never develops in my lungs - as that is a risk from the cancer I had faced. The cancer that stole my left leg, hip, and part of my pelvis.
I also have Ollier's Disease (which actually leads to heightened chances of said bone cancer) which is wrecking my fingers with tumors. Some day I will not be able to use my hands well enough to work. Possibly not even well enough to play games anymore. Here is a photo of my left hand.
I would never command someone to be happy. But I would urge them to not let the despair win.
