Dee, I know this might sound stupid and when you've been in pre labour for such a long time you probably just want to yell SHUTUP!! But, I was in pre labour before my VBAC for a week. Everything was going good, everything ready, baby good position etc. Still, I only had pre labour, nothing got me going, even Andrew suggesting a breaking of waters (which I refused). My midwives(Carolyn and Val) asked me if I was REALLY ready, if I had made my peace with everything, if I had any fears. The night before I went into full blown labour, Carolyn phoned me up and confronted me with the fears I held. I won't go into them but there were a few. Speaking them and making peace with them. After the phone call, I felt quite relaxed. I went and had dinner with some friends and joked about him never coming out! 3 hours later, the much anticipated labour began.
I know it sounds corny, it might not help but it can't hurt.
You could just write anything at all down, anything that might be bothering you, anything that might be holding you back and, if you feel comfortable verbalise them to someone, if not, speak them out loud to yourself, to Matthew, to the wall, it doesn't matter.
Labour Vibes to you hun.
Hang in there, you are doing great work!