S.M.
Poor guy. He just sounds overwhelmed. Basic seperation anxiety. Not all children are stereotyical two year old in terms of being loud boisterous little boys. He is proabbaly very sensitive and really dependent on his schedule. Instead of focusing on his anxiety this week, try focusing on how brave he is being. He is just a baby. Try making things a little more peaceful for him. He has a different temperment than you are used to. Make sure his parents know how hard a time he is having and ask if there are some things that might help. It's not an attack to try to make him more comfortable, but I wouldn't assume there is a thing wrong with him based on these limited interactions.