Hi Amanda,
I also have had both types.
I am a bit surprised that you seem to have a choice.
It seems to me that the gastric physicians prefer to use the endoscopy via the throat; whilst the ENT specialists usually use the nasal route.
I gain the impression that it is usually standard to have an endoscopy via the throat initially, with a referral for a scope via the nasal route if there are felt to be some symptoms in the larynx/pharynx or nasal passages.
If you already have been offered an appointment does the appointment letter give you someone like a nurse practitioner you can contact to discuss things with? Actually, regardless, phone the endoscopy team and ask if you can opt to have sedation (not ALL units do provide that, some only offering an anaesthetic spray).
If you can have sedation, if you go for an endoscopy via the throat, the endoscopist will see you before the procedure to talk to you; sign the consents etc., Let them know you are nervous about the procedure, especially about gagging, and ask if they can be "generous" with the sedation! I was "out" for both my last two edoscopies before they even put the scope in my mouth, and have no memory until coming round afterwards.
Some units use a sedative together with fentanyl, which is an opiate which adds to the sedation and is also a very effective pain management drug so you feel virtually nothing afterwards if the scope has made the throat a little sore.
Like you, I was VERY nervous when I was referred for a scope by an ENT specialist, as I knew they would do the procedure without sedation. In fact the doctor was brilliant at doing those, and the scope was much narrower than the one they use down the throat. Hardly any discomfort, and no gagging at all.
Where would you be having either procedure? The doctors who do these procedures, and the Unit staff, are very expert, and realise that the patients are quite worried about the procedure. If you find it hard to ask for yourself, do you have a relative, partner or friend who could talk to the endoscopy unit on your behalf to raise your concerns?
Do have the procedure as you will feel relieved to know how things are and endoscopy really is the very best way to see what is going on.
Let us know what you decide and how you get on. Either way should not be a horrendous experience, though the anticipation is pretty horrid!
Best wishes.