What Causes Nausea, Weakness, Increased Appetite And Headaches?

i have been feeling nausead and feel very weak. I don't really want to eat but sometimes I do because I am hungry. I have not had a tmperature but I do have headaches. I have felt dizzy a few times and this has been going on for about 5 days. My stomach churns and you can actually here it sometimes. If I had the money to pay I would go to the local doctor. Thanks anyway.