I too have that problem but mine is due to ligament pain. Im 32 weeks, and so ready for him to come out! Massage and warm showers have helped me a lot. Hang in there, it'll all be worth it at the end ... :)
Omg I have the same problem its called SPD Google it. Its horrible and itsucks pain all night and all day a good massage might help at this point I'm so doneat 33 weeks