COVID-19 through three waves, and a new one just beginning, some of Manitoba’s nurses say they have had enough.Dr. Cheryl Cusack of the Association of Regulated Nurses of Manitoba told 680 CJOB nurses are struggling with depression and other mental health issues, including trauma, as a result of their efforts to save coronavirus patients.And the collective low morale nurses have been feeling for more than a year is only getting worse, as staffing shortages continue to pile on the pressure.