I felt the same way when i was 5 1/2 weeks to 12 weeks, still have the odd day and i also was turned off vegies, but i ate lots of fruit and when i didnt feel like eating i made a smoothie (yoghurt, fruit & juice or milk) but doc says anything you can eat is better than nothing, don't stress too much about it my sister was sick the whole way through and all she could stomach was toast and cordial and she's had 2 healthy girls.
I take Elevit as my preg vitamin (Doc says its the best one but its like $60 for 100 tablets) but its got lots of iron and folate.