Petal02, how are things now? Did you go to the GP? As I understand it the GP can't refer you for a gastroscope (an endoscope is just the name of the instrument). See www.nhs.uk/conditions/endoscopy/ for more details.
I also think it would be unusual for a GP to directly refer to a specialist, mine wanted a stool sample first, she showed me a document of the pathway for upper gastro referral and that was something that needed to be done first. I think it's to test for heliobacter pylori the bacteria that is behind ulcers. This was a while back so things may have changed or it may have been an area thing.
When my partner has gone to the GP for indigestion, they've just prescribed omeprazole. I don't know what would trigger them thinking he needs further tests.
I got to this page from google when searching for "gastroscopy general anaesthetic" as that is what I am scheduled for in 2 weeks time. I don't actually have indigestion symptoms, though the suggestion is reflux is causing my other symptoms it's because of those other symptoms I was referred. We are on a private health insurance plan through my partners work, as we live across the road from the a private hospital, it's simply easier to go there, getting to the NHS hospital for muliple appointments and test is very difficult and often requires him taking time of work to assist me.
For my symptom set, CT scan with contrast, ultrasound and gastroscopy were suggested. We discussed how he would do it and he said he only does intravenous general anaesthetics, I had never heard it distinguished like this before. His business card says he also practices at the local NHS hospital where like everywhere else the default seems to be sedation.
I get the impression that both safety and recovery from intravenous only sedation (propofol I presume) is different from one involving gas. A while back it came up in conversation with an anaethetist friend just how different GAs have got over the last 20+ years, he says that now on any given day you are safer in hospital under a GA than on the streets and that wasn't distinguishing type.
Propofol is used in A&E for setting bones when you really need to have someone unaware of what is going on, I've watched someone have that and it's really odd, they appear awake and will talk, scream from the pain, but remember nothing.
I would be anxious about sedation only, like some other people I have a strong gag reflex, but I also have a condition that means I don't really respond to local anaesthetic, so I don't know if the throat spray would help that gag reflex. However what it sounds like is that he prefers GA as the easier route for everyone concerned, this must especially be the case if it's for treatment when it's down for longer.
I've had procedures under sedation, a difficult joint injection, the mix of fast acting benzo and painkiller left me still aware of what was going on but it went faster and could be acheived whereas an attempt without was too painful in the joint for them to touch me and get the needle in. Unfortunately it wore off before the MRI was complete (it was a contrast injection) and I had specific concerns about the MRI, though fortunately with it being my hip not my head like the most recent one prior to that had been I was fine. That MRI was also done under sedation, whilst I was an inpatient, again I experienced everything and at first being a bit out of it made it harder to cope but once they put a mirror in so I could see out it was fine. Fundamentally I've had procedures with sedation that I think are easier for me than a gastroscopy and still found them hard.
I don't want to scare anyone, you'd really like to think you could trust a doctor to stop if you said stop, but I've had dental surgery where the local hadn't worked (and I'd told them it wouldn't beforehand) and I didn't have enough pain relief or sedation and when I was yelling no and physically fighting to have them stop. They didn't. The surgeon found me alone at one point and said something like "I did it for your benefit" well, he might think it's for my benefit, but after that experience I couldn't face him for the follow up and have not been to a dentist which I was already scared of and my teeth are a mess. He took my dental phobia and crushed it to the point where I can barely cope with seeing a dental surgery let alone going in one.
Also when in labour with my 2nd I had a vaginal exam that was very painful and I literally yelled "get your arm out of my vagina" she didn't, she never said anything, if she thought it was in my best interests she was probably right, if I actually need the exam, I was clearly in transition they just wanted numbers.