Advice on an injury sustained at work?

I severely sprained my ankle falling off of a ladder at work. I fell about 3.5 to 4 ft onto a concrete floor and tore a ligament. My istant manager initially would not let me leave. I ended up working for another hour and she tried to make me stay for another 45 minutes to an hour past that. It was only once my boyfriend showed up very angry and another co-worker talked to her that she let me go to the hospital. She actually accused me of faking my injury. She put her two weeks notice in a few days prior to this. It is possible that the strain put on my injury exacerbated the severity of it. Do I have grounds to sue both her and the company (which I will not name) and if so, should I pursue it? I'm currently in a cast with crutches, a prescription for vicodin, and they are rechecking my x-rays for a possible fracture.