I’m just so sad

I can’t breath I cry for no reason sometimes or maybe there is a reason I just spent the day with my boyfriend and he makes me so happy but as soon as he dropped me off and I got out of the car I was fighting tears I don’t know why it’s hard for me to breath I need help because when I’m alone I can’t help but want to die I want the world to stop I want time to freeze and I want to sleep and ignore everything