son dose not want to leave his bedroom

hi there i have a 16 year old son with autism and sensory progressive disorder that will not leave room or go out . he has been like this for over a year. he gets very stressed when door is open to go out he will stand there and not move. i have had family doctor to him but they suggest cams and a family support worker but they have left as son is older now . i have been encouraging and patiently with him but nothing has changed help