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Let's just hope for the best.

I'll cross my fingers for you, Katie.

Meantime, recalling your original list of concerns:

a) there are a lot of people who would make me feel nervous (been there once as a patient, several other times as a guest)
b) they would screw my medication up
c) if I hallucinate and panic, they would just inject diazepam or something else into my arm instead of calming me down.
d) it is an environment where I would hallucinate more since there's nothing to do.
e) my roommate might be there.

Knowing that you're going ahead of time, is there anything you can do or bring with you that could help you counteract the above? For example, are you allowed to bring items in with you, such as books or an Ipod, so you'll have something to do?

And speaking of your parents... do they know you're going? Are they close enough that they can visit with you often?