Extreme hip and groin pain

Im 30 weeks on Monday with my fourth child. I've been having really bad pain in my groin and hip, so bad that I can't walk. I told my ob this yesterday. She seemed to think I was over exaggerating. She knows this is my fourth child and that ive had cancer before; I know pain and my tolerance is very high.

So, me crying and not being able to walk, I see as a big deal. She basically told me to deal with it. Here I am, the very next day, with pain so bad I feel like I'm going to pass out.

If I go to the ER, would they be able to give me something for the pain? Im pretty freaking desperate right now. Extra strength tylenol is NOT cutting it. I do not think I can handle ten more weeks of this.