debilitating SI joint pain

Brooke
I'm 6 mos and the pain I feel is coming from my low back is the worst pain I've experienced to date. I stand on my feet 10 hour shifts and after I get home and sit down a while I can barely move, bear weight, walk or change positions. The pain is so sharp, radiates down left leg it affects my gait. I limp and hobble around. Can hardly roll over in bed without crying. Warm baths, Tylenol, massage helps very briefly. I have not tried a chiropractor yet. I am desperate for relief. At this rate I'm terrified of how this will affect daily life as I get bigger and further along. What have some of you done to help these symptoms or have your doctor's offered any other advice?