How do you manage the sudden relapse/ breakdowns?

(20f) it has been two weeks since he broke up with me and I've been trying my best to do better, like keeping myself busy and distracted with other stuff. I'm not crying 24x7 like the first few days anymore and admittedly I don't feel like dying all the time but what do I do when I get just sudden breakdowns out of nowhere?

Like I'm doing fine just doing my stuff then out of nowhere I just burst into tears without even anything triggering, literally out of blue. And when it happens it's just unbearable pain like it feels like the end of the world. Then I feel fine again but these sudden unwarranted breakdowns are so terrible. Pls can anyone help me how to manage?

P.S : watching baby videos helped calm me down as I always wanted nothing more than being a wife and a mother but that dream died so pls suggest something else.