I've seen Sharon and she's fantastic.
I also had trouble with latching in the first few days - my main problem was engorgement when my milk came in. Bub had trouble getting enough in his mouth because my breasts were so full and hard. Not sure if this could be contributing in your case?
The other pointers that the LC/CHN gave me that really helped us to get attachment right were to bring bub's chin in first so his head was tilted back a little and then bring nipple down from his nose to top lip and then get it in there when his mouth is wide open.
Look after those nipples - lots of topless time and hydrogel pads from chemist can give short term relief (though don't use too much as moist nipples can lead to thrush).
I'm in North Brisbane and happy to chat if you like. I'm a first time mum to a four month old, so definitely no expert - just a mum who remembers how hard those first few days are.