Learning Disabilities and whatnot

So between the time I turned in my applications and now, I’ve been diagnosed with ADHD. I’ve also been deferred by my early decision school due to a rather low GPA and class rank. Should I tell the schools of the diagnosis? I’m a bit worried that the schools might not want a ex-inattentive and now-zombified (yay medication) person around, but it will explain my lopsided GPA and Test Scores (2.78 unweighted, 1420/720m2c/710wr/760ushist)

Thanks in advance for any comments.