been there, done that!
same thing, our DD was around 8 months when things got really bad and i went and did a sleepworks programe through my community health nurse(it was wonderful)
it gets you really down, cos you think what have i started?i was on the phone almost every other day to ngala, crying, telling them by 1.30-2 am i had had enough and was too exhausted to keep going into her cot, re-settling her, rocking or singing or nursing her back to sleep, only to have her wake up 20 mins later!i would just get back to sleep and she would start again! it was torture! they were very reassuring, cos at the end of the day, whatever lets you get some rest is whats really important and they are only babies and sometimes only need a bit of comfort.
but if you seriously want to put a stop to this, try the controlled crying, you will have a few unbearable nights where your neighbours will wonder whats going on with all that screaming, but each night will stop a little bit before the last.
DON"T go back into the room AT ALL(unless you think bubs is hurt)just let him go. if you go back in, he will think that you will always keep coming back. you will know when enough is enough and do it on a night where your partner can sit with you and hold you back from going in!
it is hard at first, but sooooooo worth it!
now if mia ever plays up at night (she's 15 months), we just let her go and it'll only ever last 20mins max.
she knows who's boss!
speak to your child health nurse or ngala and see if they know about sleep programes for parents to learn how to break habits and bad sleep associations.
good luck! hopefully you and your son will soon be sleeping peacefully at night!