Rachel - if you are still going and not in established labour yet. First of all it sounds like it's really uncomfortable for you and I hope things start to ramp up soon.
I went into labour after I was losing plug all day, so that's a good sign.
A midwife friend once showed me an article that says paracetamol can slow down labour in the early stages which is leading to more women having extended labours. Probably a bit late to mention it now but you could consider not taking it. (if you have been)
Also, being induced when you are so many days overdue should be easier than an induction on your due date. So if it comes to that tomorrow I hope it doesn't take too long.