You all are doing what needs doing. Still you can work hard in life or work smart. There are hospital units that I bet pay twice what you make and you only have one to two patience that require very little care. Do research. Ask around. Move.
I just met a hospital RN who is about 3 feet tall. She uses stools and seems to get by just fine. I was wondering how she pulls people up in bed, but then I realized it is all just teamwork at the end of the day.