Hey
i suffered from similar symptoms as you. I would find that even the thought of food made me feel 10 time worse.
Do you get weak, shaky or dizzy as well? If you do then you might suffer from low blood sugar. I was recommened to eat 6 small meals a day now I feel loads better (took me a few days to get into eating again though) I still feel sick a lot but nowhere near as bad as before and iv stopped gagging as well.
You should try eating a few grapes, or a spoonful of plain yoghurt, or a few small mouthfuls of fruit juice, then wait maby half a hour or so and if you feel better have some more. Nothing to big or heavy, and see if that helps. I know that its really really hard to eat when you feel so sick but I find that it helps me.