try & get yourself into a Sober Living home where you and the house rules are the boundaries to keep you sober. Take responsibility for your life. You went through rehab but now you must get into a recovery program, meetings, a sponsor and work at staying clean. Running home to a codependent mom is not good for either of you, and your post indicates that you know that. Do what you need to do to save your own life. your mom can't and the resentment you will feel for her efforts are obvious.
Take the lessons you learned in those 70 days and apply them. This is no time for procastination. You know what to do, turn off the addictive thinkin' and follow directions that you were given in those 70 days. you can do this.