sciatica pain - help!

I had some sciatic pain with my first pregnancy, but this is excruciating this time around. I walk/run a few times a week, which usually seems to help to keep moving, but I can't deal with the pain just doing stuff around the house and taking care of our toddler. I've had a really good therapeutic massage and see a chiropractor regularly but it's not helping and it's getting bad. Any tips??