Sean, I have several questions to ask of you.
1. Have you been having nausea
2. Are you taking any medications, either prescribed, over-the-counter, or illegal?
3. How long have you had this problem?
4. Have you noticed if it is in relation to meals or any other time or activity?
5. Have your parents or siblings ever had anything like this previously?
6. Have you noticed any blood in your vomitus or stool?
7. Have you had any bowel movements that are black and tarry?
8. Have you been having diarrhea
(loose stools) or noticed any other changes in stool?
These questions will help narrow down the possible problem(s) you are having.