Preheat oven to 350 degrees. Pour boiling water over oats. Cream together sugars, eggs, and butter for 3 minutes. add to cooled oats. Sift together flour, cinnamon, and baking soda. Then add to oatmeal mixture. Fold in vanilla, nuts and raisins.Pour into 9x13 greased and floured pan. Bake 30 minutes.
ICING: Mix all ingredients together and put on top of warm cake. Return to oven for additional 10 minutes. Cake should be finished but insert toothpick in center to see if it comes out clean.