The hospital I use is a locked unit, so there are no walks off the unit whatsoever. There are also no plastic cups or bottles. No strings either. Actually no sheets on the beds; they use blankets because they are really too thick to be used for a hanging attempt. The do let you have pens that they supply, but if they become a problem, they can be taken away. I have seen a patient use a pen to SI and one actually stabbed herself with a pen. So, those kind of restrictions don't seem unusual to me. My son's hospital has the same restrictions as mine did.

The bigger issue though seems to be in the support environment the the staff has created (or lack thereof). Even with all of the restrictions, I always have felt very cared for and supported and safe. It sounds like your staff isn't doing that.