Thinking back, can you remember the first time you had to deal with a real first aid emergency?
My first experience is something that's always stuck in my mind, as it was confronting and my reaction wasn't what it would be now. We were out on a night navigation exercise, ascending a spur under head torch light, when one of the students collapsed. As soon as I saw him go down, everything I learnt on my two day first aid course went out the window... I completely froze...
This left me feeling overwhelmed and helpless! I wasn't sure what I should be doing. I had this sudden debilitating feeling... I can't deal with this! Thankfully I had another really experienced teacher with me, who jumped in and took charge of the situation. The day had been ragingly hot and it turned out the boy was severely dehydrated and suffering from heat stroke.
It's hard to train for this sort of situation and until it actually happens, it's very hard to know what your initial reaction is going be and what it's going to feel like. It's even harder to know what to do about it. However, one important thing you can do in any situation, in the words of the Hitchhiker's Guide to the Galaxy, is 'Don't Panic'. Take a deep breath, be calm, collected and assess the situation. Run through the DRSABCD calmly in your head and look around assessing the area as you approach. This will give you time to put your gloves on, collect your thoughts and balance out the adrenaline that your brain has just shot into your body.
Don't let your body overwhelm you in this sort of situation. Calmness and common sense helps a great deal and first aid is not a solo effort, so if you can, call another teacher in to help manage the situation and provide support for the casualty whilst you wait for emergency services. Remember, most importantly, you're there stablising and protecting your students from further harm until the ambulance arrives.
After that incident I decided I should upgrade my training beyond the basic two day course and so I studied wilderness first aid. This helped develop my confidence in treating injuries and managing casualties, but still nothing focussed and developed my skills more than the experience of a student walking up to me dripping with blood from massive cuts to his chest, hands and stomach! But that's a story for another time!