A (good?) update

It's 2:54 in the morning and I just got off the phone with my Mom, who says she's back at the rehab facility and that - and here I admit skepticism - her heart condition was misdiagnosed. She says it was COPD and fluid buildup in the lungs, along with blood in her throat. I've been in a funk for days, but I'm hesitant to release my worry. How could that possibly have been a mistake? The doctors (presumably) aren't quacks, and I heard the diagnosis.  .  .