Do you always get the nausea after you eat anything or is it only certain things??Because it sounds like a food allergy or the fact that you have a problem with your digestive system not wanting to digest your food. Im not doctor but thats just what it seems like to me.
I have also had these problems and have taken a medication for nausea and it helped.
good luck and let me know what happends.
Can you provide any more info on your medical history? Have you ever had surgery, or any other abdominal conditions diagnosed? Have you seen a doctor yet for your current symptoms?