Take a deep breath and realize that we live in one of the best places on earth for you son and that he will grow up to be a great person. EVeryone has obstacles to overcome - this is a tiny bump in the road and you'll get past it.
My son's 1st gade teacher suggested that I have my son evaluted for vision, hearing, etc and assuming they were all normal then to have him eavluated for ADHD. I cried at that parent teacher conference, and cried as I drove home. But I went ahead and had him evaluated by pediatric neuro something specialists at the children's hospital about an hour away. He took a test on the computer that evaluated his response time and whether he actually thought about his responses or if he jsut jumped to answer things. Since he was only in 1st grade the computer test was pictures and shapes on the screen, some moved, etc. He was off the charts for ADHD.
We did a number of things over the years - we did go to medication which helps enormously. WE've always used the lowest possible dosage and the medication that only was designed to last about 7 hours. There are many that are time released for 12 horus - but that can interfere with bed time. 7 hours get him through school and homework. We also only use the medication on school days - not during vacations and weekends. his ability to focus at school and learn what he needs to learn has improved so dramatically.
We also did the Feingold diet - which essentially removes artificial ingredients from your child's diet. It can be really difficult to follow - especially at school and at other kids' houses. But it was somewhat helpful - but very expensive. We found that the artificial stuff that triggers my son's craziness is more artificial colors than preservatives and other stuff. So we no longer follow Feingold rigidly but we avoid artificial colors as much as possible.
Do some research - what you'll find is that people with ADHD are generally highly intelligent and can be very high acheivers in life. The trick is to channel their skills and energies into the things that they are best at. There are some books by Mel Levine and Cynthia Tobias that are very helpful and there are a few other books about ADHD that are enormously encouraging.
What I've learned about my son (who's now in middle school and doing very well) is that he learns best when he's in motion. So we used to do homework while he jumped up and down, or threw a ball back and forth. When he'd complete a longer task he'd run a lap around the house bwefore starting the next one, etc. I would tell the teachers in the beginning of the school year about his learning style, etc. The problem is that schools are designed for kids who have a learning style to sit and listen. ADHD kids have a tough time sitting and listening. So read up and learn about your son's learning style and strengths and encourage him in those ways.
He will do really well if his parents and teachers understand him and his strengths. If ADHD is ignored that child will be frustrated by the education process, his teachers will find him to be a trouble maker, or a difficult student, etc and he'll have a negative experience with school. If it's addressed and his strengths are addressed and nurtured he'll do really well.
Some of the best sales people, corporate executives, dynamic youth leaders, and other "successful" people dealth with ADHD as a child. While it's tough to deal with in the education system we have they can have wild success in life. (think about society 150 years ago when a kid worked side by side with his father as an apprentice blacksmith, shopkeeper, farmer, or rancher - ADHD was the PERFECT education tool for that!)
You go mama - get that kid what he needs and watch him thrive!