I have been seeing a chiropractor since about 25w of pregnancy for my back pain and since I have been seeing her I haven't had any major problems. My back now only hurts if I do silly things like bend over too much, walk around too long etc. I would recommend finding one, but find one who has lots of experience working with pregnant women.

Otherwise, like the others have said, try wheat packs, getting DH to rub your back and maybe look at getting a body pillow to start supporting your bump and hips as you will eventually find that you can only sleep relatively comfortably on your side.