“Kidney stone pain - emergency room? ”

I have been dealing with a bad kidney infection and kidney stones for almost a month now. I am currently on my third round of antibiotics. I had another CT scan last Thursday and they said I have three new stones. I'm assuming they have started moving now, I am having excruciating pain in my left lower back, lower stomach, and down my left leg. Do I need to go to the emergency room, or should I just wait it out until I pass the stones? I would rather not have another ER bill, but I don't know if I can take this pain for much longer.