Yalla,
I truly empathize with you. When I'm good, I'm really good. But when I bomb, I truly bomb. But we are our own worst critics.
I'm doing a fellowship and I've had to do several presentations. One was to deliver the opening address at a conference on behalf of my entire agency! I had the thing memorized to a T, with the proper voice inflections and all. I then got up there and read most of the talk b/c I was so nervous. It was well received, but I felt so weird being the only one that read from my notes as everyone else pretty much winged it (chalk it up to experience).
I also did a presentation on MRSA at a national conference to a lay audience (my first presentation at a national conference), and my supervisor kept reminding me to be fluid and not so rehearsed (as many presenters are). So, as many folks have mentioned here, I memorized some key points, kept talking to myself in the mirror, in the bathroom, whenever I had some downtime. I had serious butterflies right before the talk, shaking almost uncontrollably, but after about a minute of stumbling, I was okay. In fact, I was surprised when I got the two minute mark and had to speed through the rest of my talk (always be prepared to shorten your talk to cover main points if you run out of time).
On a less happy note, I did a community presentation and totally bombed, just lost everything. Ended up apologizing to the audience several times for things not coming out right. And that my friend pretty much blasted my credibility with more than half of the audience. It sucked. The few people who came up and said, I understand what you said, even though you couldn't get it to come out right, well, didn't make me feel too much better.
I did finally get the nerve up to join Toastmasters. No matter how corny it sounds, it has helped me tremendously. No, I'm not perfect now, and nor will I ever be (esp. since the above situations have all happened within the time frame I've been a member of this organization), but it helps to be able to present and get constructive feedback from a friendly audience. It might help you in the future to sit in on a couple of meetings and determine whether or not it would be helpful for you (I personally think that even the best speakers could find some benefit from TM). If you're interested and want to find a club near you, see
http://www.toastmasters.org. And I'm not only a member, but I'm also the Vice President for Education.
🙂
Also, drugs are no good. I would consider laying off of caffeine and sugar for about two days prior to your talk (although it seems to be the case that we load up on these things, esp. when nervous - and they aggravate our nerves). Also, the morning of your talk, get up and get some exercise. You'll get increased blood flow to your brain, and you'll be less jittery. You can also try a soundproof room immediately before your talk - just go in and yell or sing really loudly for a few minutes. You'll get all the tension off your chest, and if you've still got a voice, you'll have an excellent presentation.
Hope this helps. You'll do very well, I know it. PLease let us know how the talk goes. Best of luck.
Take care,
H&T
EDIT: My bad so long.