"Numbing the pain for a while will make it worse when you finally feel it" - JK Rowling, Harry Potter and TGOF
When something bad happens, and you feel sad or angry, don't try and push those feelings away. The worst thing ever is to act numb to the pain because once you let yourself feel a little bit, all that time you tried to ignore those emotions will come flooding in and hurt you so badly. If you're sad, let yourself be sad. Cry or scream if you want. It's better to let yourself be sad then and get over it as soon as possible then have it build up inside of you. If you've just been dumped, lost someone close by death or just got a bad grade - just allow yourself to feel whatever emotion that comes to you.