Child on Metadate CD but has underlying anxiety issues

Patient: My 10 year old son has been taking Metadate CD since the 1st grade (now in 4th) he started off at 10mg and now 40 mg. He was diagosed with ADHD witha language learning disability (expressive/Receptive). It appears that he has underlying anxiety, lack of self esteem, worrying about things that Adults worry about and constanlty asking the same question over and over again, brings up problems after it was discussed and resolved but still doesnt feel confident about it. I am wondering if he should be taking another different ADHD medication, do you think the metadate CD is causing this?