Yeah, even though parents can notice early on, doctors don't like to give a definite diagnosis until they are older. Especially when children are in their terrible 2s anyway! I hope that whatever you decide to do, your child gets better.
For both of your sakes!
PS-Most teachers are very understanding of this disorder...but many are not! Make sure that you keep in contact with the teacher to make sure they are doing all they can. I presently have a student who's in 8th grade (I teach Spanish). He's been failing practically all subjects for years! EVERYDAY after school he comes in with me and I keep him organized. We go over his assignment pad, all his homework, and I help him when he needs help. I talk to his mother all the time and all his other teachers. It's midmarking period now, and so far he's not failing anything! He even said, "can you imagine if I make honor roll?" I'm so proud of him.