Rachel - I had a really odd labour that stopped and started for a couple of days after my waters broke. It was really strange, and actually I thought I had a while to go yet (except for the fact my hindwaters had broken).
Have a read of my birth story, I've just posted it, and you'll see that when it did finally happen, it was all pretty quick. Especially the last bit of dilation.

One thing that really worked for me was nipple stimulation. Pinch and squeeze the nipple for 1min, then rest for 3-4mins, then try the other side. Keep going for as long as you need to, but to be honest after about 15mins, I was having contractions hot and heavy until my concentration was broken again.

Have a lie down and relax, I was told to visualise a circle.
And to be really honest - my contractions were about a 7 until the last hour or so of labour. So the level of pain might not be a good indicator. It might just mean that you are too busy to think about it all!!! Specially running around after a couple of littlies

Good luck - I hope something happens for you soon.