What can I do to make my boyfriend’s 28-day stay at a mental/rehab hospital better for him?

Question by SKHYHIGH: What can I do to make my boyfriend’s 28-day stay at a mental/rehab hospital better for him?
I am 19 and he is 17- will both be a year older in less than a week.
He was asked to go to outpatient rehab by his dad (got caught with weed once, and got messed up on xanax once), and next thing I know friends from our work are calling to tell me they admitted him for 28 days against his will.
He is at a mental hospital that also works with substance abuse patients, so I don’t know if he was admitted based on substance abuse, mental problems, or both. (By the length of stay I would say both or mental problems.)
My boyfriend has problems with anger, depression/self-loathing, and very bad attachment issues towards me (aka smothering).
He is also constantly paranoid that he’s done something wrong, upset me, mad me angry and that I am going to leave him.
His dad, for some stupid reason, hasn’t decided if he’ll give permission for me to visit him or not.
I know for a fact that he is resisting very hard, and very angry towards his dad, for not being able to text, call, or see me.
I have been admitted against my will to the same hospital years ago (they lied on my assessment for unknown reasons), and I know how alone you can feel and how extremely bored being in there can be. I want to make it easier on him. I want to support him in his time of need.
I hope I gave you enough information. Some things I already thought of were to bring him a book, journal and some crosswords and/or sudoku.

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