Agreed. If you drink that much before a working day, you better make sure you can handle it. My staff party was the night before my work day and everyone was really drunk, including myself. I stayed up super late, and only had maybe 2 hours sleep. Still, I woke up extra early feeling like shit, made sure to get to work earlier than usual to do extra work assigned to me and another coworker, and made myself perform to my usual standards because I made the conscious decision to wake up with a hangover and so it was my responsibility to do a good job despite that. My coworker however, came in 40 minutes late, leaving me to do everything and acting hungover and didn't accept responsibility for his decisions. Don't be like that. If you know you won't want to work and won't perform as well, then you shouldn't drink on a work night. If you do, suck it up, and do a good job because you have no right to complain :) Point is, whether you were more like me or my coworker, you still deserved it. Just like I did. At least you had fun the night before!

She might have had to work both weeks even if she was in a normal state.

26 - But she thought she had to come in the first week. Even if she wasn't supposed to she shouldn't have drank if she thought she had work and that it would effect her work.

Maybe she hasn't had bad experiences with it in the past.

I hope OP is getting paid for it, otherwise that's bullshit.

46, it's likely an unpaid internship, which OP would've known about when they applied for/interviewed for/accepted it. What's BS isn't that they aren't getting paid, but, rather, the fact that OP decided to be irresponsible and get so drunk they were hungover on a day they knew they had to be somewhere early.

Probably complaining about having to work while having a bad hangover. OP deserved it though.

Internships in Brazil are usually payed. But his nickname suggests that his isn't

A week extra of grueling work is not to be considered as a good thing or "experience" in some cases.

Depends... But I have to do one for my MSc degree, and I'm sure as hell not doing an unpaid internship!