12 year old ASD and probably ADHD mental health

Hi all,

Im UK based. My son is 12 and out of school. Least of my worries. Slight smile

He is in his room and rarely comes out. Wont shower or have a bath and i have to "battle" for him to clean his teeth. 

Constantly telling me and his mum to go away and if we do get into his room, he covers himself with a blanket. 

Recently soiled himself cause he wont come out of his room although this is recent. 

Autistic burnout or depression... Thoughts??