Yep, mine have got bad in the last 2 weeks (am 23 weeks), exacerbated by walking (or any exertion really) and in bed.
I went to the physio, though it was just for a group class which was the quickest way to see her to start off with, and there was a picture of a body and it said to indicate where was painful - I asked if I should just colour the whole body in!
I am getting cramps in the night, pain from my hips down through my legs which I can't work out if it is muscular cramp or sciatic nerve. My coccyx aches and between my legs burns. I am sleeping with a pillow between my legs, but it doesn't help a lot. When I was at the physio yesterday I saw my midwife briefly and mentioned why I was there, waiting for my physio appointment, and she said to go to the GP for some strong pain killers, which I did today (she also signed me off work for a couple of days, I must just look thoroughly tired and fed up!) and have got some codine tablets. Am hoping that will help, even just to get a better nights sleep for a few days.
Don't know about your local PCT but where I am they have Physio Direct that you can self refer too. They are very good. Also recommend an osteopath if you can afford it (I can't which is why I went to the hospital physio).
It really sucks doesn't it? I hope it doesn't get worse for you but I would get seen to as soon as you can. The physio will give you some tips for sitting and sleeping etc.