Four days now I have had Sharp excruciating pain in my lower back. I'm in tears at times just trying to move normal. Sitting, driving, and laying down hurt. What is it, what should I do? My tummy feels nausiated when I wake up and I also am getting headaches. Are these related?

Right side, whether front or back, can be acute appendicitis, which can be serious, so go to an ER. If your appendix is gone, you may have sciatica, which is just a very painful irritation of the sciatic nerve, but I think you have something else. If not your appendix, then any number of things - cyst, etc. You haven't really given enough specifics.