K.J.
I experienced this type of pain for both of my pregnancies. Both times I found similar UK pages as you, but nothing US related, and my OB wasn't very knowledgeable about the subject. It kind of gets brushed off as a regular ache and pain - but it completely different. It's not just pressure, but it feels like something is broken on the inside. My OB also suggested the maternity belt, but honestly it did nothing for me. Another suggestion was seeing a chiropractor to have myself adjusted every week, but I never took that option up. I never found anything to take away the pain, but sometimes having a heat pack on the pain helped a bit as well has trying to lay down as much as possible (which is hard with young ones around, I know). Once I gave birth, the pain went away shortly thereafter. I really feel for you and hope that you don't have to suffer too long.