Inclusion Criteria:  Canadian healthcare worker, first responder, or military member Experienced a traumatic or extremely stressful situation in the course of work related to COVID-19 ≥ 18 years of age Scores at above clinical threshold, as defined by the investigators, on at least one of: Patient Health Questionnaire-9 ([PHQ-9] score ≥ 10), Generalized Anxiety Disorder Scale-7 ([GAD-7] score ≥ 10), and/or Posttraumatic Stress Disorder Scale-5 ([PCL-5] score ≥ 33) Access to a computer or a tablet with high speed internet access, be able to clearly see the screen of a computer or tablet, and be fluent in English Ability to provide consent  Exclusion Criteria:  Elevated risk of suicide Currently enrolled in another intervention or treatment (e.g., cognitive behavioural therapy) for stress responses related to the COVID-19 pandemic