"Going bananas" is a casual phrase that means to become crazy or to lose control of one's emotions. There are many synonyms that can be used to express the same idea in different ways. Some alternatives include "losing your mind," "flipping out," "going insane," "losing it," "going off the deep end," and "going crackers." Each of these phrases emphasizes the idea of losing control, but they may have slightly different connotations. "Losing your mind" is more extreme, while "going off the deep end" and "going crackers" suggest a sudden and intense breakdown. Regardless of which phrase you choose, they all convey the same message of someone reaching a state of heightened emotional distress.