We have to take your claim on your drinking ability at face value so it's very much possible that you were drugged (roofied). Are you worried that someone had taken ... advantage
of you in an intimate manner? If so, then get yourself to the doctor as soon as possible. If nothing bad has happened than its just merely a lesson learned (regarding keeping your drink safely in sight) and an extra trip to the doctor to tell you that you're in relative good health.