I couldn't help myself and started crying uncontrollably at the thought of having to give up running.

我不能控制我自己的情绪，想到我不得不放弃跑步就不由自主的开始哭泣。

youdao

His father and uncle fall to the ground, crying uncontrollably. After 11 years of not knowing, relief of finding a child they thought had been lost forever pours out of them.

他的父亲和叔叔摔倒在地，哭的不可控制。已经11年没有消息了，得知原以为那个他们倾注全部的孩子永远的丢失后轻松了许多。

youdao

She completely fell apart right there in the hallway, and started crying uncontrollably.

FORBES: Tears and Fears: Dealing With a Crying Colleague

Her sister Deanna wept uncontrollably as Knox was led out of court crying.

BBC: Amanda Knox guilty of Meredith Kercher murder