C.S.
I suffered with the same thing the last 2 months -it was horrible. It was just the baby growing and pushing up there. I only had one baby and it was very painful so you must be miserable. I used a heating pad a few times that helped a little but really nothing really worked. I just suffered through it and once she was born, I noticed the relief right away. You can try to shift and maybe they will move but they run out of room. Hang in there - you are almost there!