I took a Communications class for Public Speaking, so I know what it's like....
Okay, but for the future....
If you have to do a presentation......
1. Practice enough to feel comfortable, but you don't have to have it all memorized.
2. Scan your audience before speaking....
3. Don't try to look at one person too much or too little.
4. If you can, talk about something you're comfortable talking about and what you're interested in sharing.
5. Smiling helps a lot.
6. Give yourself a prep talk before going in.
7. Know that you're not the only one nervous when presenting something.
8. Posture is very good because it makes you look more confident and you can breathe more easily if you stand up straight.
9. Wiggle your toes.
10. If something goes wrong, carry on like nothing happened.
11. Get enough sleep and eat well before your speech--- sounds obvious, but again...
this ties in with 12.
12. Dress well, take a shower, deodorant, etc... before the speech....
Hope that helps.