1. Apprehensive uneasiness or nervousness usually over an impending or anticipated ill.
  2. A state of being anxious.
  3. Mentally distressing concern or interest.
  4. A strong desire sometimes mixed with doubt, fear, or uneasiness.
  5. A cause of anxiety.

Anxiety is an emotion, but at extreme levels it can also be classified as a mental illness. Medically diagnosed anxiety can be an abnormal and overwhelming sense of apprehension and fear often marked by physical signs (such as tension, sweating, and increased pulse rate), by doubt concerning the reality and nature of the threat, and by self-doubt about one’s capacity to cope with it.

If this seems like a serious issue, please consider seeking outside help or support from a professional.

Specifically, the emotion of Anxiety in relation to the future is found in the Spleen meridian in the Earth element.

Definition from Dictionary by Merriam-Webster.