Experienced mommies please help with my back pain!?

This backpain is WAY worse the second time around. I'm 26 weeks along and I can only stand, sit, and lay down in a certain position otherwise I'll feel HORRIBLE pain in my hip bones and lower spine. It feels like my spine is about to pop but never does. It's HORRIBLE and even wakes me at night! Taking a bath I have to put down a towel to sit on or face the consequences...and I'm not even going to think about trying to stand at work.....(ow...) Anything you girls have done to ease the pain. Note: I have to sleep reclined due to heartburn.