I had horrible hip pain throughout both of my last two labors and none in my first labor. Regular contractions were NOTHING compared to the hip pain. I truly thought my hips were breaking. With my second baby, it was a homebirth and we ended up transferring after pushing for 5 hours, she was born via vacuum extraction. My third baby was born via c/s because after 3 days of laboring with the hip pain and vomiting every half hour or so, I was so dehydrated I could do nothing. All I wanted to do was die. I'm sorry to see that other mamas have had to deal with it, but it makes me feel a little less alone.
Hip squeezes did little to nothing for me unfortunately, except for wear out my entire birth team, including two midwives, two support women and my dh. I've heard the only way to combat this type of pain is to see a very good chiro throughout your pregnancy, so that your hips are in alignment or something like that. I'm scared to death that this time will be the same so I've made my first appointment for 20 weeks. I'm hoping that if I go twice a month until 34 weeks and then once a week for the rest of the pg, I'll never have to experience this pain again. I'm afraid that if I feel it with this labor, I will end up insisting on a c/s (which is what I really really do not want).
By the way, I too had sciatica pain during my last pregnancy, and while that was horrible, for me it was very different from the hip pain I experienced during labor.