You, very wisely, cannot post. But, I'm assuming you can still read the thread.
A tragedy in our health system, yes. Uncommon, no. Stories like yours abound, most are factual at their core. According to a perspective piece on PBS medical mistakes are now the third leading cause of death and injury in the US. The Third!
You are wise in getting a knowledgeable aggressive person to advocate for you. Others can learn from this and already have a HIPPA authorized and aggressive person on hand to represent them. Need not be a lawyer, just someone who cares and is not on the facility staff.