If your doc does decide to give you some meds to help calm your anxiety be sure to do a practice run or two with the new med to see how long it takes to kick in and if it has any adverse effects on your memory or speaking.

I know power point is the thing now but when I was giving presentations at work I made notes for the overhead projector. It gave the audience something to look at besides me and it helped keep me on track about where I was going in the presentation. If appropriate you might also pass notes and suggestions for further resources and stuff depending on how much content you are covering. Again it helps to give them something to look at besides you.

I think it would be entirely appropriate to let your audience know that English is not your first language.