I agree with @Anonymous that you need to consult with an attorney.
Having said that, a DBA is not an entity; so a DBA can't be under an LLC.
The single member LLC is the legal entity that provides the legal protection. Discuss this with an attorney so you know the next steps, which may involve getting some insurance.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.