common things which help include:-

o making sure your tummy doesn't get empty
o dry crackers or toast (saladas, vita-wheat, etc)
o mineral water
o ginger beer (the bundaberg one is good, because it has real ginger in it, not just flavouring)
o jelly beans
o cold, juicy fruit, like watermelon and grapes

but there's loads of different things that different women find good.

The only major thing I found worked at all was that my morning sickness wasn't as bad if I got a lot (and I mean LOADS) of sleep - 12+ hours.

And fizzy mineral water helped to clear out that disgusting fruity cordial-y flavour ...

I really hope you find something which works for you, hun!!