i have had three labours started through having my waters broken, at 15 and 17 days 'late'. i had to have my waters broken as i am allergic to the prostin gel they use to induce.
i was very wary of having my waters broken as if it didnt work then i would need the syntocin drip (had it in my first labour) which like you have experienced is NOT pleasant.
however in all three labours breaking my waters was enough and i started in labour, with ds2 i started straight away and he was born 7hours later.
with ds3 they broke my waters and i had mild contractions but not much was happening, consultant getting techy, esp as he was technically 18days late by this point (it was after midnight) anyway i had a good midwife who said no, baby is fine, go away, mum just needs to rest.
i had a nap for two hours, woke up at 2am, contractions started shortly after that and ds3 was born at 5am
ds4 (8wks old) again i got to two weeks overdue, went in had my waters broken at 8:30pm, not much happend to begin with just niggly back ache, so i stayed mobile and went for a walk etc, 10:30ish started having proper contractions, continued walking up and down and bouncing on birth ball, 11:20 got into birth pool, and ds4 made his appearance as 6 mins past midnight.
so it can work and you can have good natural labours, i just had gas and air each time, used the bath for pain relief and was lucky enough to get the birth pool for ds4
hope everything goes as well for you xxxxxxx