my brother left for boot camp, i miss him?

my brother just left for boot camp about 6 hrs ago and i cannot stop crying.

he is my best friend, i never really noticed that until the moment he left.

i never told him how much i love him and how proud of him i am.

we actually got into a fight before he left and i feel horrible about it.

i always do that, get into fights with him and regret it later on.

after boot camp he has to go to some school, he will be gone for 6 months.

i have never felt so sad and upset as i feel now. i cant stop thinking about how long it will be before i get to see him. how can i stop feeling so sad? him and I live together. we both moved out of my parents and have lived together for like 4 years now. even as i write this, i cant help but cry remembering all the good and bad times we had together. i miss him so much. how do i stop feeling this way??