Call bell addict patient- how to handle?

[psych nurse in training]

I'm in clinical for Adult Health 2 and was recently caring for a patient who hit their call bell at least every 5 minutes to get their pain medication. When I explained that someone was getting it and discussed how I was watching for them to come back from the pharmacy, the patient was assuaged, but only for a moment. A few minutes after I would leave to watch the floor (med/surg), they would hit the bell again and we would have pretty much the same conversation. The only think that gave me a little reprieve was when I told them "I'll send out a search party to find the nurse I'm working with at 11:00. It's 10:45 now, so that's in 15 minutes." Orienting them made a bit of a difference and, when they hit the call bell again in 5 minutes, I could simply say "it isn't 11:00 yet, so, like we talked about, I'm not ready to go hunt down the nurse yet." This patient was not only seriously physically ill, but could be diagnosed as "gravely mentally disabled" and 5150'd because they couldn't take care of themselves or make reasonable decisions about their health. They also had one of the more disabling and intractable psychiatric diagnoses.

Just before 11:00 rolled around I found the nurse's number and called them. Of course he showed up right as the phone was ringing...

What can I do with call bell addicts like this, where they just don't get the fact that we are doing what we can? This patient's perseveration and lack of rational thought process was actively taking away from my attention to others' needs.

My preliminary thoughts:

If I was an actual RN in this situation- light a fire under pharmacy to get them to deliver the damn meds. Inform charge nurse. Inform nurse manager. Ask for a sitter (none were available, as is often the case at this placement). I have also seen nurses let the call bell ring for an extended period, although I felt uncomfortable doing this because it could always be an actual problem and it would look bad on me.

As a student nurse it seems like I am not free to use these options, like I am just visiting and not entitled to use all the tools an RN has. Maybe that's just my misinterpretation.

Any suggestions for working with patients and facilities in situations like this?

Thanks!