Anxiety

Noun

1. An unpleasant state of mental uneasiness, nervousness, apprehension and obsession or concern about some uncertain event.

   "generalized anxiety disorder"

2. An uneasy or distressing desire (for something). Endeavor (to please).
3. A state of restlessness and agitation, often accompanied by a distressing sense of oppression or tightness in the stomach.
4. Any anxiety disorder, especially generalized anxiety disorder.