The phrase "like a bundle of nerves" is often used to describe someone who is extremely nervous or anxious. However, there are several other phrases that can be used to convey the same meaning. For instance, you could say that someone is "jittery," "butterflies in their stomach," "on edge," "tense," "high-strung," or "fidgety." All of these phrases evoke the image of someone who is feeling restless, uneasy, or apprehensive. Whether you're trying to describe your own feelings or the behavior of someone else, choosing the right synonyms can help you convey your message more effectively.