nobodysfool,
ketones are a serious worry in diabetics if you have high blood sugar - like double figures high (alhough I think my clinics tollerance was 8.5) other than that it is probably due to not eating enough - or not drinking enough.
In all 3 of my pgcys I have had massive ketones - and have been IDD (insulin dependant diabetic) they ended up giving me a blood ketone monitor, as my blood sugars were always OK.
If you do have high blood sugar and showing ketones please call your maternity unit. You could ask your GP/MW for a prescription for ketone sticks so you can monitor your own urine.
It sounds like you need to be refered to a dietitian, as you certainly shouldnt be hungry, if your body isn't dealing with carbs then you need to be on insulin rather than starving yourself.
For me when I was pregnant a typical days diet was
breakfast, bowl of allbran with milk,
snack, a piece of fruit
lunch, 2 slices of bread with tuna,
snack, another piece of fruit, 2 digestive biscuits
dinner, vegetarian sausages, baked beans, baked potato
snack, 2 slices of toast and cup of milk
which although it was good carbs (wholemeal bread) there was certainly enough to keep me full.
Hopefully your diabetic team will sort you our pronto, but if you are hungry Im assuming that is why you are showing ketones.
You sound like you are having a hard time - hoping things start falling into place.