aww Dionne I hope it improves for you.
Like you said it's proberly to do with the fact that you're body is not used to food any more, and your stomachs proberly shrunk.
As long as you try eating little and often things should improve, I imagine at tho mo it's abit like how you feel when you have morning sickness, you want to eat but even the thought of it make you wanna be sick.
It's good that you are goin to see you gp if nothing else they can at least check you over and make sure the pills have had no other advise effects. I hope they can help, just a thought and sorry don't mean it if this sound rude you could ask them to referre you to a dietrition and maybe they can help you with some sort of plan on what to eat and make yourself feel better after all thats the most important thing, how you feel about you.
anyway good luck
xSuzx