now a days i think you can get a helper to side with your cj=hild in school

I would start with physical causes first. Make sure he is not allergic or sensitive to anything, or have too many metals in his body or be anemic. My son reacted strongly to many things in food. Now his behavior is so different! You will have to shell out. You can try to get the school system to pay for some things but it is a big struggle and if you have the money just pay it and avoid the delays. You will probably have to go to a naturopath, most mainstream doctors will not be able to help you.
After that is ruled out, just knwo that there is no good one test for dyslexia. One place I think undertands dyslexics is the Davis Center out in California. Google them and they have centers all over where your son can be tested to see if he is really dyslexic. The screening is about $100-150.
Good luck!

I took my son to the Sylvan Learning Center until the school finally started doing what was needed

My daughter is also 7 years old and is in 1st grade for the 2nd time. We just recently found out about the very strong possibility that she has dyslexia, we are awaiting the test results.
He needs to be tested for learning disabilities by the school. If that shows that he may have an LD but they are not sure what it is then have him tested for Dyslexia. Most schools do not test for dyslexia, some schools even go so far as to say dyslexia is not real. If you have him tested for it and he has it then the tester will give you a formal write up and by law the school will have to make accommodations for him.
The behavior problems could be due to his embarrassment and/or frustration of not doing well in school. If all the test show up negative then maybe your pediatrician can write a referral to get him tested for ADD, but make sure you rule every thing else out before you do that, many schools and doctors are so ready to give a pill with out fully understanding what a child my be really struggling with.
If it is dyslexia programs like Sylvan are not good for them. There is a really great system that the school is using with my daughter called the Barton system. She has been using it for 3 months and her reading and sight word count has become very close to grade level and her behavior in class is much better because she is not so frustrated.
Brightsolutions.us and Bartonreading.com will give you all the information you need about dyslexia. Susan Barton did an inservice with my daughters school and since the school has started using it with children who are having trouble with reading they have seen a great improvement.

I have heard that Lindamood-Bell helps a lot of people but is pricey.

I have dyslexia and I have a son who is ADHD. When he was younger he was extremely hyperactive and I was desperate too. I know some people are against using drugs but ritalin worked for my son right away. He was able to sit and work for the first time in his life. I would also like to recommend a book called Unicorns Are Real. It tells you how to work with your son at home by using colors. Have him write his name and spelling words in a different color--each letter of the word gets a different color.