I took 2000 mg of advil at once, am i at risk?

If you have normal kidneys and liver, you should be able to metabolize this medicine. You took close to the maximum daily dose all at once. You should definitely not take any more for the next 24-48 hours. If you begin to feel ill, then go to the nearest ER so that you can be evaluated, including bloodwork to check renal and liver functions. Best of luck to you!