My paed said that it's not what the mother eats but the fact that the baby HAS to eat - does that make sense? It doesn't matter what the breast milk tastes like, it's not that that's causing the problem, so a change in diet doesn't help a lot.
Although, saying that, I have given up caffeine (didn't drink a lot anyway) and only eat small amounts of dairy and found that to make a small difference, but I am pretty sure that the losec is doing most of the work.

Sue x