I'm not going to say I understand, because I don't. I don't know your situation or relationship. All I can say is that I agree wholly as my dad was diagnosed with ALS and I learned of this only 3 months ago. It isn't the same, but it's shown me how important spending time is with loved ones.
Talking about it truly does help. Withholding emotions doesn't make one stronger, instead confusion and anger build up. Grief is a part of life whether anyone wants it or not. The best we can do is learn to deal with the grief in order to become stronger and help others through the processes.
As cheesy as it sounds, you will get through it. Probably one of the harshest sayings is "Life goes on", but it's true. Unfortunately, life doesn't pause for anything. School still comes around, holidays pass, and friends come and go. My advice is to find people who care about you and that you care about to be free to talk to.
Another hardship is the fact people often "don't get it". It isn't to blame them, they just don't comprehend your scenario. They attempt to see things from your perspective or offer support, but the truth is that they just don't have the experience you went through. Finding people who actually understand your situation more thoroughly is extraordinarily helpful.
So that I end off in a more joyous note. For anyone reading this, you have friends and family who will be there for you thick and thin so that you can move forward from grief. Those who make you laugh at bad times, or create a smile. Also, don't forget to make others smile