breaks in a relationship. help please.

my boyfriend and i are currently taking a break and it was his idea. we started yesterday because he said he needs a break from a relationship to be happy on his own. i need to be okay and just not emotionally unstable. i’m 19 and have been with him for almost 3 years and it’s so hard on me right now because we lived together for a year and have been so off lately. i need to get through this emotionally? how do i do that? i keep feeling like i have to throw up and constantly want to cry. :( thank you.