crisps, crisps, crisps, crisps, and a few more crisps
BBQ beef hula hoops are brilliant, as are twiglets. cheese and onion or salt and vinegar crisps also good
mini cheddars with Dairylea and cucumber slices
little chunks of cheddar cheese (those kids lunchbag mini versions are good)
plain croissants or brioche
breadsticks or plain crackers
marmite toast
tinned heinz soup - tomato or chicken or mushroom
those 'tangastic' fizzy haribos
but at times they really help
fruit squash or flat lemonade/coke to drink
and if all else fails a few more crisps!
As you can tell it's all about the carbs and the savouries for me (except the fizzy haribos!). Can barely even chop up apple and strawberries for the kids at the moment - the thought of ingesting any myself makes me heave 
The good news is that despite this mega carb content (and averaging 3 bags of crisps daily to keep nausea at bay - and that's in addition to normal meals - I know it sounds awful) I seem to have lost weight so far, not gained it