Lord do I know about the claustrophobia!! My son does that too.
We had had some of it in the past but when he went on Lithium it became unbearable, he couldn't be alone anywhere! Attached to me like an appendage. I called him shadow! lol

Anyhow, it's getting a bit better now he is on Clonazapam but not over by a long shot.
Sally, Mom to Jacob 9 (Bipolar, ASD, Expressive/Receptive Language disorder, Anxiety, Tourettes Ben 10 and Max 3