I hate to say this but it is true; If you want stability, hospital nursing is not where it is at. It seems it never has been, either.
And you clearly don't understand what PRN nursing is about. Please let me tell you what my responsiblities as a PRN nurse are:
WE DO HAVE A RESPONSIBILITY to the hospital at which we are employed; we have to work two weekend days a month, we have to work during all the major holidays in turn as you do, we are expected to attend all staff meetings, keep our education up to date, keep up on all certs, etc, and be available for mandatory call JUST LIKE "regulars". We have to meet all requirements the hospital has for "regulars". I am curious, what responsiblities do you have that I do not?
And regarding my differential...well......15% really will only go so far, after all, I do not get medical bennies, education bennies or PTO as you do. Think that 15% covers that? Think again. Yes, I would like some of these benefits, however, I work PRN for a lot of reasons, mainly childcare issues--- and I do NOT elect to be PRN because I want OUT of "responsiblities" you mention.
I am PROMISED NO minimum of shifts I fill holes "regulars" don't want---- but when I am scheduled, if it is not my turn to take call-off, they call the person whose turn it is. I am "bound" by my agreement to work that shift just as you would be. So if they call off the next person whose turn it is, how can that be unfair?
I have to say, I am Glad I dont' work in places where PRN are treated as NOT needed (versus "as needed") myself.
Funny thing is, some people obviously want us to cover regulars who call in sick, take vacations, etc, but do NOT want us to have any equal footing where cancellation comes in. It would be hard to keep PRN staff on hand under conditions like you suggest. I would not do it myself. I would just travel/do agency. The only reason I don't is cause I am treated so well and fairly where I work and I get to know the staff "regulars" where I am. I definately am part of their "team" and there is no "us" and "them" mentality. They know me and I know them. So it works for me. Good thing is, also, the "regulars" where I work don't seem to have a problem w/it, either.
Finally, I am sorry about your frustrations. I can see your distress. Maybe that is where PRN have an "advantage" because I have never been happier about MY work situation (and I was 0.9 FTE 3 years ago).
Talk to your NM again about these issues and try if you can, to make changes. Or you could try changing your own situation to make things work for you. Nice thing is, nursing has so many opportunities. Try agency or traveling if you want to control your destiny more. Or do PRN if they are treated well where you work. But definately DO SOMETHING to make yourself happy. Life is way too short. Good luck and happy trails.