Pelvic pain!

I've had the worst pelvic pain the last week. I can't stand on one leg while putting pants on, or else I have excruciating pain right at the bottom of my uterus (where my bump ends), standing or walking for longer than five minutes results in severe pain and pressure, and last night the pain was so bad I was crying trying to fall asleep. Not to mention the back pain has definitely worsened now that I'm bigger. I called and asked my doctor what I could do besides Tylenol (that wasn't working) and he said "Have the baby", so I'm at a loss here. Does anyone have any advice? Anything that helped you? Are heating pads safe to use? I'm 35 weeks.