Baby won't sleep longer than 2 hours and I'm losing it

Our son is 6 weeks old and I think I'm hallucinating from lack of sleep. My wife and I are trading off nights but neither of us is getting more than 4 hours total. Everyone keeps saying it gets better around 12 weeks but I honestly don't know if I can function that long. Is this normal? Are we doing something wrong? We've tried everything. Should we be more strict about a schedule or is that not a thing with newborns?