If you're completely unable to swallow, they won't be able to do a naso gastric tube. I think if you have an option, the PEG would be preferred. With a nasogastric tube, they will NOT put you to sleep. They simply insert the tube, then x-ray your abdomen to make sure it's properly placed.

Mine was done initially in surgery. They placed a couple of stitches inside my nostril to retain it in proper position, which of course I ripped out accidentally the 2nd day I was awake.

The tube was removed, then relaced. The second round was enough to keep me HIGHLY motivated not to have a nasal tube placed again, if I could avoid it.

If your Doctor is not acknowledging your stress levels, talk to someone else. There is no need at all for you to be this stressed
Wayne