When you're in a hurry, it's important to communicate it accurately to those around you. While "I am in a mad rush" is a clear expression, there are many synonyms you could use instead. For example, you might say you're in a hurry, a rush, or that you're pressed for time. Other ways of expressing this sentiment might include saying that you're running late, or that you're on a tight deadline. Whatever you choose to say, make sure that you communicate your urgency accurately and clearly so that those around you can accommodate your needs.