If your child is very action oriented, hands-on and never seemed very interested in learning to read this may be the problem. He may catch up later when he settles down a bit, but you are likely to have a hard time getting this kid to read. Some temperament types have a large discrepancy between their spatial or abstract intelligence and their verbal abilities. Einstein, for example was brilliant spatially but had difficulties in school and was never considered much of a writer. Many NTs report a large vocabulary but become tired quickly when they read.
Dyslexia comes in many forms and there is no single cause.
Some people have problems decoding letters. Some people have trouble listening or speaking languages. Trouble getting along with friends. Some temperaments are especially prone to have peer problems. Try using a camcorder to tape your child with his friends and then play back his behavior so he can see it.