long floor-length formal collection in black

PP

I'm 20 weeks pregnant and have terrible back pain. Upper and lower back pain, siatica and now have terrible pain in my pubic bone. I can't take cocodamol as it makes me vomit. Is there anything that will help ease this pain? I have a pregnancy pillow that I use at night but doesn't seem to help. And wondering why so much pain so early on in my pregnancy? TIA long floor-length formal collection in black