Break Up Advice?

Me and my Bf broke up 4 days ... we were together for almost 3 years... It didn’t end on good terms and honestly i don’t know how to handle it. I’m so hurt and my chest feels so heavy. I lost my best friend. I’ve been trying so hard to keep myself busy. Its now all starting to hit me and i don’t know what to do with myself. I can’t stop crying no matter how hard i try it’s just all water works. i have to go to work tomorrow and honestly i don’t know how i’m going to make it through the day.. Am i being over dramatic? This is my first relationship & break up so i honestly never experience this kind of heartache. Pls comment advice? Ever been through this before? and how did you guys help yourself get through each day? Because honestly i really feel like i can’t do this everyday.