Has stress caused my anxiety disorder?

Possibly: When someone perceives something as challenging or threatening anxiety or feelings of insecurity begin. This ordinarily quickly ends when stressor leaves. Those that are anxious-reactive (genetics) experience stress that persists even after the stressor is removed. This elevated baseline anxiety contributes to catastrophic thinking, harm overestimation, and emotional reasoning -> tension ->.

Probably yes: Stress is one of the major causes of anxiety disorder. However, stress could just be a trigger. Just like, if you have diabetes, eating sugar can modify your condition. What you probably also may have is some predisposing factors like family history, difficult childhood, low self esteem, difficulty trusting others, and forth. Managing stress can help a lot as you cannot change much about other.