Intense anxiety in school, fear of fainting/collapsing there

I know that the anxiety comes on in school because I hate school and feel very uncomfortable there, but I've got to find some ways to cope with it. Even on a good day I will still feel some anxiety. I have this fear of fainting/collapsing in school even though I've never fainted before and I know that I probably never will even during my worst panic attacks. Once I start to get nervous, I begin feeling lightheaded and then I just worry and panic that I might pass out. This is much scarier if I've had coffee (obviously), but I refuse to give up coffee.I have given up coffee for weeks at a time when it's gotten really bad, but the anxiety is still there and I always go back to coffee. How do I just convince myself that nothing is going to happen and avoid the panic/anxiety attacks in school?

Other than tell yourself you're not going to faint, I don't know. I've been there. In fact, thought that I might feel faint a few times today, probably just tiredness, but I could tell it was close to turning into a panicky situation, and I just had to put it out of my mind and tell myself I was just tired, and anxious, and nothing horrible was going to happen to me. And it didn't.

My change in breathing is my first clue of impending panic. As long as I don't hyperventilate and use a measured 'breathe in/pause/breathe out' mantra, I can usually return to a calm and peaceful state. I have trained myself to be very aware of my breathing.
Find your natural rhythm. Best of luck to you.