You should contact attorneys who handle professional liability. Use the AVVO search function.

It depends on the fee agreement between you and the attorney, including if it is an hourly fee or contingent fee. If you are paying hourly and...

You can protect your social security income if you take proper action.

It depends on the actual agreement. You may have to sue.

If you have no income or collectible assets, they can sue but get nothing. But they can still contact you and take other actions.

Having the money not go through the LLC could prevent the protections of the LLC

Yes. But the amount you could recover may not warrant a case. Consult with experienced attorneys. Use the Avvo search tool to find an attorney....

It depends on what the agreement says. If none, case just goes to trial.

Court's may limit how far back one can go, depending on the case. A Motion for Protective Order may be needed if a compromise cannot be worked out...

Get to a qualified doctor right away. Once what is wrong is determined and treated you can consider a malpractice lawsuit.