ADHD & Homeschool questions

[MamaAmber803]

My son is a beautiful boy that is very high energy and at this point he is tremendously behind the other children in his class. I am terrified that I haven't done enough, that his future and his confidence may suffer because I didn't take thing seriously enough. Last year @ the age of three my son was diagnosed by three different doctors with ADHD. I believed them, tried medication, immediately took him off (i just couldn't stand the idea of giving him medication). Well, here I am a year later and things have improved greatly with his impulsivity and other behaviors, he no longer gets up and runs around the classroom, but my son has not retained anything that has been taught him in this whole year. He is still unable to name a single color (though sometimes he can point it out for me) can't name a shape or point it out, can't identify letters or numbers and can't count in sequence. I don't know what to do. The classroom setting is not working for him but neither is one on one time. I work with him at home and can barely get him to sit still to do a lesson for 2 minutes, well he'll sit but his eyes will wander and it seems he's getting anxious. He's a smart boy, at the age of two he could do more on a computer than I could, he has hooked up the dvd player to the television, he knows his way around electronics. I am heartbroken because he has a twin sister that does so well in class, she's already learning to read but the idea of him being held back and her going forward hurts me for him. Of course if she truly needed to be moved forward I would be sure that she did. I am just at a loss. I am seriously considering keeping him out of kindergarten and homeschooling him. I feel that nobody is going to take his education more seriously than his father and I. I also feel that herequires a different approach to learning than a traditional classroom allows. I am terrified that I may fail him, that he'll not learn his own potential, I am so scared that I won't be able to find a way to teach him. Right now we are doing a color of the week we have a sheet of colored paper hanging on the wall with it's name written on it and throughout the day we ask him to find and point out that color. He seems to like the idea of playing this game I just hope that he is able to retain what he learns, but then where do I go from here? How do I help him prepare for learning in a classroom setting? Also, should I pull him out of his preschool program since it is so hard for him to learn there or should I allow him to continue going and teaching him at home? Will doing both burn him out? Ahhh if anyone can help I would appreciate it greatly.