Your case isn't settled until YOU sign off on it. Please see my answer to your other question - what does your fee agreement say?
Demand a meeting with your lawyer to explain what's going on in your case and why the lawyer is recommending this settlement.
Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.