I'm not sure if u are sad.But pray for u and wish u lead an abundant and happy life.Life will go on.Followings are my answer.
我不开心,好想哭。
or
我很难过,好想哭。
Commonly,when people are sad,they prefer to speak less,i imagined my sad thing,and i will express"i am sad and i want to cry"as "我很难过,好想哭"in Chinese.