My first recommmendation would be don't look at the internet, as the sites I saw when I looked were about Children with very very severe disabilities, not the kind that would only be picked up after a child went to school.
Next, I am dyspraxic (I believe, I haven't been officially diagnosed) but I got through school fine, and even went to Uni, even ending up at Oxford for a while. I also can drive!
A school is not qualified to diagnose, they should have said "he shows signs of..." or "have you ever considered..." or "his behaviour is consistent with.....".
What you should do now is take him straight to your GP and request an appointment with a paediatrician/occupational therapist to find out if he is dyspraxic. If he is they should offer you some therapy and help.
Next if it is Dyspraxia it is not your fault, it is to do with the migration of certain brain cells before he was born. And even better there is a lot you can do to help him now. Talking honestly to him about the condition will help too. Also from my experience, people with Dyspraxia can learn to do just about everything, they just need a lot more practice so they get to the automatic stage (eg. with a dance they will still seem unco-ordinated until they no longer have to think about the moves). Often they also need to learn about personal space as a set of rules.
I believe a lot of Rugby player types I have known have been dyspraxic.
So first get it diagnosed by someone qualified, and then do what you can to help him.