It is absolutely not an emergency.

There are many procedures for discovering and for fighting the stonewalling in discovery.

Use the Avvo search tool to find an attorney. https://www.avvo.com/find-a-lawyer

Go see a doctor right away. Yes you may have a case if the harm caused is sufficient to warrant a lawsuit.

What described is happening too often in the medical field. Consult with experienced health care advocate attorneys (not malpractice attorneys)...

There may have been a breach in the standard of care. Malpractice means that a doctor violated the standard of care. A bad outcome is not enough. ...

Where there is a breach of the medical standard of care and the breach led to sufficient harm to warrant a lawsuit, there may be a viable case. ...

A case is possible. Such cases have may difficulties. But, to determine if there is a viable case consult with experienced malpractice attorneys. ...

Sue the person that owed the money.

Yes, likely you do. Consult with experienced probate and collection attorneys.