Hello! I'm an anaesthetist :-)
Ok. Anaesthetics are safe. I always make my patients 3 promises when they are as nervous as you sound
- they will fall asleep
- they will stay asleep all the way through surgery
- they will wake up at the end.
I don't promise that they will be pain free / not feeling sick when they wake up, but I do my best!
You will be seen by the anaesthetist normally on the day you are admitted. He/she will ask questions about any medical conditions, any meds you are currently taking and any allergies. They will double check that you have had nothing to eat or drink and check out how well your mouth opens (and ask about loose teeth).
Here we ask you to sign consent for GA, but in the UK your consent for the surgery counts as consent for the anaesthetic required.
In theatre or the anaesthetic room, you have monitoring put on to watch your heart rate (ECG), blood pressure (cuff around your arm) and oxygen levels (peg on finger). They will put a drip into a vein for fluids, ask you to breathe oxygen through a face mask (smells like plastic!) and then put the anaesthetic medicine in through the drop - normally a strong painkiller followed by the hypnotic. It can burn a bit into your hand or arm as it goes in.
From your point of view - that's it. You fall asleep.
While asleep the anaesthetist will be giving meds for sickness and pain relief, fluids as needed and watching the monitoring to make sure you are asleep and that your heart rate, blood pressure and oxygen levels are normal. If you need extra meds for anything we have cupboards full :)
At the end of surgery you will have meds given to reverse part of the anaesthetic and the anaesthetic you've been kept asleep with will be turned off. As you breathe it out and the levels drop you wake up.
You then get transferred to recovery for an hour or so - to make sure you're awake enough for the ward, comfortable, warm, etc.
It's natural to be scared (I was somewhat apprehensive terrified before my GA for minor surgery last year!) but you will be fine. Anaesthetists are all lovely people :)