I have consulted medical help a few time in the past but it was just a sore spot then, not pain that made me want to sit. No one identified the cause. I love the internet because you can really research something like this. It's a common problem for women (1 in 4 women) because our anatomy stresses all those bands of muscles and ligaments.
Using a foam roller has made a tremendous difference in a pretty short time. I am also doing some exercises to strengthen my hip abductors.
Exercises for the hip abductor