There are several synonyms for the phrase "climbing the wall", which denotes the feeling of restlessness or frustration. Some common synonyms include going crazy, losing one's mind, jumping out of one's skin, and feeling anxious or unsettled. Other similar phrases include pacing around, feeling antsy or fidgety, and being on edge. More extreme synonyms may include having a breakdown, going berserk, or experiencing a mental breakdown. Regardless of the specific phrase used, the meaning remains the same - an intense feeling of discomfort or agitation that may manifest physically or emotionally.