Anxiety and depression can occur together or cause one another. Symptoms like difficulty sleeping, upset stomach and irritability can all be signs of both anxiety and depression.
Anxiety vs. Depression: Telling the Difference
Health Anxiety Anxiety and Depression Association of America, ADAA
Difference between Stress depression and Anxiety
The Difference Between Anxiety and Depression – Priory
Anxiety vs. Depression: How to Tell the Difference - Baptist Health
Difference Between Anxiety and Depression