One question - have you seen a behavioral optometrist? If not, you might want to consider getting a full eye exam for your son, especially if he might have dyslexia and reading issues.
I say this because reading can be linked to visual deficits and visual processing issues. The eye exam at school is for visual acuity (far- and near-sighted) and doesn't exam perceptual skills or other visual skills like visual memory that we use daily. There may be something with converge or tracking that is remedied with vision therapy. Vision therapy can also help with classroom anxiety. It's really training the eyes, brain, and body to work together.
Personally, I have not had success with pediatricians referring me to experts and various therapies/interventions. I've done better talking to other parents.
