It appears that the lawyer you talked to described all the possible options. Based on your facts, I don't see any other options.
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship. Also, keep in mind that this is an INTERNET BLOG. You should not rely on anything you read here to make decisions which impact on your life. Meet with an attorney, via Skype, or in person, to obtain competent personal and professional guidance.
Based on the facts you have shared, it appears that you have been given the right guidance. Make sure you marry someone you love, not merely because they are a United States Citizen.