Anxiety is defined as a feeling of worry, nervousness, or unease, typically about an imminent event or something with an uncertain outcome.  It is a physiological disorder meaning that it affects your cognitions as well as you feeling it in your body. Anxiety is a common experience that can be situational or psychiatric in nature, and it can sometimes be linked to depression. 

Evidence-based treatments to decrease or eliminate anxiety include cognitive behavioral therapy, medication management and psychotherapy. 

Anxiety is very common and treatable. 

Anxiety by Harvard Medical School
Anxiety Disorders by the National Institute of Mental Health
Psychotherapy Guide for Generalized Anxiety Disorder by Verywell Mind