I won't say yes or no here but 2 things stick out to me. Well three things. actually.

Seems like everything is happen to you after you read about it. That's the first thing.

If you do have BP, you are cycling very fast, which is entirely possible. But have you have long periods of depression or mania earlier in your life? I am sure it's also possible to have BP pop up out of no where, but most BP people seem to have some kind of hints from when they were younger. That's just an unprofessional opinion and assumption based on my limited knowledge.

Thirdly, the getting drunk doesn't mean a whole of of anything in this, imo. Yeah, you never drank before, but I would guess there are plenty of 20 to 21 year old college students that have done exactly what you did and it had no relation to their mental health.

It's good that you are getting it looked into with a professional, those are the people you need to see at times like this.