Post-traumatic stress disorder is a type of anxiety disorder as I understand so yes it can be one reason your heart failure developed. I strongly believe mine happened because of high stress level for years and very high for a few months. Even with family history, viral infection, and long time not treated high blood pressure that all also factors, and I had them all ,if the stress level wasn’t that high that I had I probably never get down that suddenly and badly. I never got my answer from any doctor: why exactly? The answer was different from all doctors.:) I know from myself :all the 4 factors together were getting me down.