His preschool teacher is concerned, but thinks he may make progress. A child this young often cannot remember enough detail to vocalize what may have happened to him before the adoption. Remember while Autism and Aspergers syndrome can explain many behavior anomolies,there are also many disorders not easily identified without extensive assessment. It is VERY important to correctly identify the cause of your son's problem. This way the proper treatment can begin.
Improper diagnosis does almost as much damage each year as no treatment at all.
The location of your residence can also be a great help or hinderance. Let me know where you live and what particular assessments you have undergone. I can be of more help if I have more information. Welcome to the Special Needs Forum. Maybe you have questions about specific conditions or treatments.