krhea75,
You are doing all the right things. I know how hard it must be. . . I can remember lying in bed on a bitter cold January night listening to my son cry and plead to be let in and not letting myself give in. These memories never go away, but they can be replace by better ones.
I believe that by "raising the bottom" for him—he was able to pass through this period in his life more rapidly, as we let the natural consequences pile up. He is in his 3rd year of college now and is doing great.