You poor thing
My DS had reflux but nowhere near as bad as your DD has. He went on Losec at 2 weeks and was off it by 10 weeks. Still spewed terribly up until about 8 months but was a happy chucker.
We tried a chiro who was excellent - he actually looked DS over at the first appointment and said that while they in a lot of cases can help reflux, in DS's case everything spinal was fine so he wouldn't waste my time and money. While I was frustrated because I desperately wanted a solution I was amazed at his honesty!

I am in Perth too so PM me if you want details. My friend also takes her DDs to a chiro as well so I can give you a couple of names if you're interested.