i have to give a presentation on monday?

I'm trying to think what the best one single tip I could give you out of all the things I want to say about this, that's going to benefit you the most...

Ok so firstly, make sure you are prepared. Focus purely on the presentation and fine tune it so that you know exactly what you've got to say, when and how. You might even find that moving all of your attention on presenting to perfection, the way you're going to practice over and over again no until you have to do it for real, takes away the fear of the reactions from those you're presenting to anyway. Focus on giving the presentation in a structured way so that you don't have the worry of forgetting what to say or what comes next etc. Another really great, albeit basic, technique I learnt in my sales career is consciously slow everything down. When we're nervous, we start rambling, our brain struggles to process our thoughts properly and then you forget what comes next and it all starts to go wrong, and the more that starts going wrong, the more nervous you get and it goes round and round and round. Start with your breathing, manage it consciously and keep it controlled and don't rush to get started. Think about how you're presentation starts and then do the same with your speech...consciously speak at a slightly slower rate than usual. That way, you're brain can keep up and you'll find it easier to follow your agenda.

Try to take away the power of the fear of things going wrong. If you're life isn't at stake, then it really isn't worth worrying yourself sick about.

Good luck!

Knowing what your presentation is to be would help giving council about how to handle the situation.

If what you wrote is any indication of how you would be in front of a crowd, then you have a right to be nervous.

Have you tried taking speech or public speaking lessons?