I have been in for

I was never strapped down for that reason, nor were any others that were in there for those reasons. The times I have seen people strapped down was for acting out violently, and one guy got it because of running through the halls naked and frenzied. They basically got a shot of ativan and stayed in a locked room until they slept "it off". So, keep your clothes on when in common areas and try not to act violently
In regards to wearing your own clothing. Yes, absolutely. Along with being able to wash them yourself. You might want to bring flip flops or something similar to wear in the showers. Although, they're pretty clean, eh...i personally don't like my bare feet touching the shower floor. All, in all...although at times very boring. I an effort is most certainly made to keep you comfortable while you are there.

PS. I agree 100% with what some of the others have said. It can definitely be a life save...If you feel you need it, then go...nothing bad will happen to you.