I agree with CosmicRose - try talking to your prof. Some of them can be extremely kind and caring and I bet they would understand. Plenty of people struggle with anxiety so im sure they have come across this before.

If the presentation is necessary I always found it helpful to write out a script word for word about what you want to say. That way if you get flustered and panic you can always go back to that script.

I dont know much about medication but I hope you can work something out with either your doctor or you prof. Good luck with everything