Sciatica

This is my second pregnancy. My first went smoothly and I had sciatic pain for maybe the first 6.5 months and then it magically went away. Now I am almost 6 months pregnant with twins and my hips and back hurt so unbelievably bad. I do hair for a living and am in my feet sometimes more than 10 hours. I wear a belt but I swear it almost makes me pass out at times and I see a chiropractor often. I'm worried this is just going to get worse. Any ideas or suggestions?