My advice is to grieve in the way that comes naturally to you. If you feel you must stay in your room because being around the rest of your family or friends would make healing more difficult, then go right ahead. If you want to stick to a simple routine in order to feel stable and work out your feelings, do that too. Take care of yourself and eventually the pain will start to go away.
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FUNNY DEATH METAL LYRICS OF THE WEEK: 'MADNESS OF THE DARK SHADOWS' BY KRABATHOR
I step alone the sacricase
Who don't leads nowhere
Pictures on the wall
I see the first time
Tired to death