@NurseAddywow that is so great! that's a huge step! I remember I did the same thing one. I refilled my prescription and the next day, flushed it--maybe it was divine intervention? or just my true self finally taking control. It's kind of like a game of catch-up with your addiction--you have to beat it before it beats you. Now that you are clear headed, perhaps you should consider pushing up your appointment or calling your doctor to let him know you have been abusing the medication (otherwise your addiction might creep in when you're having a bad day).
As far as the guilt, just let it go. It's NOT your fault. Yes you made the choice to abuse it but you weren't in your right mindset when you made that choice--the addiction was clouding your judgment and you just couldn't say no. Addiction is a sickness, and like all sicknesses, it can get worse or better. But you have the power to do what you can to avoid getting tempted again, whether it's calling your doctor sooner than your appointment, letting a family/friend know about what you're going through, or eating a lot of junk food, do whatever makes you feel good without Adderall. I know food tastes a lot better when you're off it right? But seriously, what makes you happy?