Okay, take a deep breath & try to hang onto the fact that
there are many possible reasons for "hearing voices." I'm glad that you have a doctor's appt Tuesday. You don't say which sort of doc you're seeing, but at this point it doesn't matter ... anyone is a good enough doc to start with.
Please be totally open & tell all. In fact, showing your above post might be a good place to start. You will need various tests, depending on how long it's been since you've had a thorough physical exam.
You sound like a good person who's under a lot of stress. Starting college is hugely stressful, all by itself. I'm glad you've found this place because it's full of good, caring folks who will be able to identify with much of what you're going through.
Please keep posting.
Roadie