This might not help but..... My daughter is just finishing midwifery training and has done a hypno-birth course (She paid for it and in her own time ) She helped her friend thro a very long labour and her friend had no pain relief at all; in fact the duty midwife had to ask when the contractions were happening as the mum was so in control. I would say it works!!
angel....just a little anecdote. As a med student doing midwifery (I hated it) a pregnant woman was seen in O.P's with Hyperemesis gravidarum ( pregnancy sickness) all tablets had failed including the usual "myths".One of the registrars had "dabbled" in hypnotherapy and we all crowded into this side room and he started his "chanting".
After an extremely boring 10 mins, he clapped his hands and the woman sat up, smiled and "pucked" all down our white coats.
Work sent me for it about 7 years ago to control my temper and calm me down. It worked to a degree. But it was no 'cure' so to speak. I am calmer but im not 'fixed' - I would try it again though.