Hello My Name Is Carrie And For The Past 2

Hello my name is Carrie and for the past 2 weeks I have lost my appetite, I'm normally a very good eater. What happens is I'm very hungry and want food but once it's ready I have 2 bites and feel sick, I'm not over weight or under weight, I don't know what to do as its getting too much for me know as I'm very hungry. I would be great full for any information on what I can do
Thank kindly
Carrie