It may not be worth a lawsuit but could be a valid bar complaint.

No, it is a valid way to approach the matter.

Yes. And it may be a lawsuit. It is questionable if bringing a lawsuit would be worth it.

In most jurisdictions not but there are exceptions.

Yes they can. Note, he must respond in the legal way and on time with, for example a motion or an answer with affirmative defenses. Failure to...

Your next step would be to sue the homeowner who will pursue her insurance company.

You may have a lawsuit. Consult with experienced attorneys.

Consult with experienced malpractice attorneys directly by email or telephone.

She might. Malpractice means that a doctor violated the standard of care. A bad outcome is not enough. Another doctor would be needed to evaluate...

Complaints to the medical board may be your only route to address the situation for malpractice on another living adult.