I was considered lacking and retarded in elementary school. I never participated and refused to do my classwork due to the tedium and monotony. I find that feelings of boredom amongst gifted children are viewed as problematic; we are held back rather than promoted. I promise you things will get better though.
It was not until recently that I discovered I had an iq of 170; even though I have been teaching myself material and researching independently for years. The loneliness overwhelmed me and the "gifted" program at school--when I finally got in--still was not stimulating in middle school.
We are such a rarity that many in the school system do not know how to react to us. It is not necessarily an easy thing to be gifted--this disavows the expectations about giftedness.
Just hang in tehre and provide the best support you can. Sounds like you are already a good parent!