The phrase "fever pitch" is often used to describe an intense level of excitement or emotion. There are several synonyms that can be used to convey a similar meaning. One synonym is "climax," which refers to the pinnacle of a situation or experience. Another option is "zenith," which denotes the highest point or peak of an activity or feeling. "Frenzy" is a good synonym if the excitement is particularly chaotic or frenetic. "Intensity" can also be used to describe a high level of emotion, without necessarily implying the positive connotations of excitement. Finally, "mania" can be used to describe an extreme level of enthusiasm or excitement.