What is that scary feeling in your stomach when you get shaky?

The feeling you describe is commonly referred to as butterflies in the stomach. It is a sensation that is often associated with anxiety, nervousness, or excitement. It is caused by the release of certain hormones, such as adrenaline, which can cause your heart rate and breathing to increase, and your muscles to tense up. This can lead to a feeling of unease or fear, which can be accompanied by a queasy feeling in your stomach.