Re: New here, and desparatly in need of advice.
When you say you are being put under, do you mean a General Anesthetic.
I have had four Endoscopys and two Colonoscopys. On one occasion I had both done at the same time. Mine was done under local sedation where a light sedation is used, I had no problems at all and whatever they used to sedate me I had no recolation of any of the procedures. When I came round I was given a drink and biscuits. I was starving as the pre-Colonoscopy procedure cleans you out.
You may have a slight sore throat for a few hours (I did on one of mine) after the Endoscopy but it soon goes. I experienced some wind/gas after the Colonoscopy again nothing to worry about, soon goes.
In all you have nothing to fear, I was scared the first time but if it had been bad believe me I would not have had three more. I think the whole procedure took about 20 mins.
I wish you well and hope this gives you peace of mind.