HELP! 30 weeks in excruciating pain

Please help! I need advice I'm 30 weeks pregnant and in excruciating pain!!! My underwear line the bones & muscles there feel like they're breaking, my tailbone feels like it's splitting from the bottom up, I can barely walk, sitting is unbelievably painful and I can't lift my legs more than a few inches off the ground without cryinggg!! I was sobbing for 20 mins straight it hurt so much. I don't think I'm in labour at all but I don't know what to do about this pain or how to handle what's left of work!