The phrase "losing it" is a common expression that is often used to describe a situation where someone has lost control of their emotions or mental state. However, there are many other words and phrases that can be used to convey a similar meaning. For example, "snapping," "cracking," "freaking out," "having a breakdown," "losing one's cool," and "going crazy" all capture the idea of someone losing control. Additionally, words like "unhinged," "deranged," and "unstable" can be used to describe someone who is no longer in control of their emotions or actions. By using a variety of synonyms for "losing it," you can add nuance and variety to your language and effectively communicate the intensity of someone's emotional state.