I had same problem I would definitely suggest getting a good chiropractor. That is what I had to do took a few times before it started working but I feel so much better now. I wish you the best of luck I know what you are going through and its no fun at all.
Some chiropractors have specialized training caring for pregnant women during/after pregnancy. I would suggest you have a reputable provider in your area, and receive and examination. They will be able to determine the structural issues at hand, and likely provide beneficial treatment.