Have you heard of AlAnon?
I suggest you try a few meetings.
And reading "Codependent No More" by Melody Beattie.
These will get you started on the road to recovery.
Also, There is the Big Red Book (like the Big Blue Book for AA) for Adult Children of Alcoholics. I think you will see yourself there, and get some insight to your view of life and the world.
I am glad you dad has chosen rehab.
Have a wonderful graduation weekend in Boston!
Beth