MAJOR Sciatic Nerve Pain!

I'm 33w3d and this sciatic nerve pain is just killing me! The doctor said that all they can do is physical therapy, but I have no idea how I am going to fit that into my schedule right now with work (I'm trying to train my temporary replacement and I have a very difficult job). I sleep on my left side with a mass quantity of pillows (including one between my legs). I'm expected to "exercise" yet I can barely move my right leg. Sometimes when I'm walking, my right leg completely gives out and I almost fall. Sometimes it's not AS BAD as other times, but I'm about to lose it because it hurts so bad. Does anyone have any suggestions?