What can I do to miss my mom less?

My grandma died yesterday and my mom took or to Europe (where she lives) as soon as she herd about this to take care of my grandpa. I barley even had time to say goodbye since it was only a few hours in advance and she was almost always busy packing and doing other stuff. It's only been about a day but i already miss her :( She has never left for buisness trips its always my dad who goes. I have been to sleepaway camp and i didnt have a problem there. I dont know why but i just miss her so much. Its just me and my dad left and its not really fun. I barley ever cry but i have been crying almost non stop since she left I dont feel comftrable around my dad so i always wait till he leaves and then burst out into to tears. My dad and I aren't close and I don't really want to be close with him. I love him and everything but i don't enjoy being around him too much because of his personality. What do you suggest I do to help me through this. My mom is coming back in a week or 2 i think. I have tears in my eyes when i'm just writing about this because im thinking about my mom and my grandma. This is also the first relative i have ever lost that i know of. Please help me i am very lost and sad.