Oxycodone and alcohol interactions?

I recently burned my hands pretty severely, so I'm taking Oxycodone (5 mg) as a pain reliever. The last pill I took was about two hours ago. Also, I have an exam later today, and I was freaking out, so I took a single shot of brandy about an hour ago to calm my nerves. Now, I'm feeling a bit dizzy and disoriented. Did I do something bad?