Is there anything else besides betablockers?

is there anything else besides beta blockers that works for public speaking because I have a persuasuve speech for my final grade in college and Im a nerve wreck when it comes with public speaking, I dont need tips on how to speak I need a damn beta blocker for this but dont know of any that I can buy over the counter, please suggest something that i can buy over the counter that have the same effects as beta blockers, I tryed vodka and no it didnt work, i was now drunk and nervouse on my midterm speech and got a 75%