Hiya Rach, I could have written your post...I'm exactly the same and have just gone for an appointment with an osteopath two days ago and although I'm still waking up once or twice with pain it's not as frequent or as severe so it might be worth ago. It is a horrible burning pain isn't it, just horrible.
While I was at the appointment I got her to check my tailbone which I hurt when I gave birth to my daughter and it is so damaged and bent the wrong way she couldn't find the end of it so I'm terrified what implications this will have on this birth, so now I have to worry about that as well.
Well I hope things get better for you, cheers Missy