Unfortunately, you cannot go back to the Court now to ask for modification of the property settlement because of change in your financial situation four years after your divorce became final. The property settlement that you made in 2005 was made based on the assets that you had at that time. See Revised Code of Washington Section 26.09.080:
http://apps.leg.wa.gov/rcw/default.aspx?cite=26.09.080
Attorney
Massachusetts licensed Attorney with over ten years in general law practice.