Such great info, and Experiances everyone! I appreciate it!

Okay, the reason I have asked this question:
my 7yr old Son has ADHD, he was Diagnosed 3yrs ago. I have chosen to not medicate him, over these past years, But I am seriously rethinking this plan. things have gone down hill again, quite drasatically! I am once again recieving phone calls almost daily, referral notices alomost daily, and I just dont know what to do. His attitude has become more and more explosive! The last phone call from his teacher, was Heartbreaking! She informed me that he will more than likely be held back this year, not because of his accademics, but because of his Mentality. Not that being held back is a bad thing, but he is so smart it just kills me. He is being very disruptive in class, having major blow ups, tantrums, and has once again begun hitting himself! getting him to change directions is very difficult, if not almost impossible. Monday after a huge Tantrum episode in class he passed out for 2 hours! the teacher had to wake him up to go to Gym class.
I am just at a loss as to what to do. I feel that these 3 yrs withought being on meds, cause i felt it was the best thing, has held him back. All I can think, is if i had gotten him on meds, when he was diagnosed, things would be different. I am so confused! I think i might have seriously messed up!
All I want is to have my sweet and loving son back,a nd for him to have the best of everything.

Sorry if this dosent make much sense, but I get so Emotional when I talk about it.