I really feel for you, your post is bringing back memories of giving birth to my son. I had contractions from the Monday and gave birth at 9am on the Thursday and was absolutley knackered!!
In the end I just went in so that I could have some pain relief and I was just fed up of being at home and relaxed a bit once in hospital. I had gas and air and pethidine which meant I could rest and chill out in between contractions, then they broke my waters and I think this made things quicker.
I hope lo gets a wriggle on for you, but dont be afraid to go in if you feel yourself getting tired as you will need to save some energy xx