Lulu,
I was told different things work differently for everyone, so give anything a try.

The one that worked for my daughter is Weleda relaxing drops.

Another thing i thought of which may or may not be helpful, my cousin had a lot of probs getting her daughter to sleep and they worked out they couldn't bath her at night because that hyped her up, but then came along baby number 2 and he had to be bathed at night or he wouldn't settle.

Another thing, have you head of the Queen Elizabeth Centre?? it is a facility in dandenong (I think), they can possibly give you some help. I found out about it after I had started getting my girls sleep patterns under control.

Good Luck
Sjl