When should I see a doctor?

Let me begin by stating that I am not sexually active, and I am still a virgin! However... for as long as I can remember, I've had these very strong, very randomized bouts of nausea. It won't go away once it begins. I was tested for anemia, but that wasn't it... but I'm starting to think this could be really serious if its interferring with my studies and life...
When should I see a doctor?
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