I don't know much about end stage liver disease, though I don't like the name. Does that mean doctors just give up on treating you for anything? Have you taken him to the emergency room? My lymph nodes in my neck swelled up like that and weeks later I ended up having to have them removed. Fortunately, they were not cancerous but were a sign of another, treatable problem(Sjogren's syndrome caused by hep C) and in part, to fighting infection (hepatitis) or from tx(interferon) for so long they just burnt out. At first they thought it was due to tooth decay, but at any rate, once they started slowly swelling, first it was swallowing, then drooling, then wheezing, and eventually probably death if untreated since I wouldn't be able to breathe. Funny thing was, my neck didn't seem that swollen, but they removed like ten glands. By the way, I've read that Sjogren's syndrome is supposed to increase my chances for lymphoma up to 44x the average person.
Usually, if something swells and doesn't go away and interferes with my ability to swallow (I'm a real baby) I figure it's not going to get any better on it's own. In fact, my son's lymph nodes swelled up so bad due to an allergic reaction that he ended up in intensive care intubated and nearly died--due to penicillin allergy that they couldn't seem to diagnose. They thought it was mono and kept giving him penicillin and nearly killed him and now he had epilepsy.
I think everyone deserves to be comfortable, I mean comfortable, whatever their state of health, and in control of their own destiny. Your son must not enjoy choking. It must affect his drinking somewhat. My grandmother died of ruptured esophageal varices due to cirrhosis of the liver, which made her choke too.
Also, to quote my own ill-fated words as a teenager, looking around at all the old rockers I knew, "Wow, it takes a long time to go from burned out to dead." And the way there is neither glamourous nor necessarily something to be proud of. The way you live on the other hand can be a source of pride and can provide enjoyment. I hope your son can realize this and quit his bad habits, even though things look bleak for him, because things can always become worse, suffering can become greater, and you can spread your unhappiness, bad mental hygiene, etc. I know a little what you're going through, I struggle with my teenage son to take his medicine and not to take drugs. I hate it.
I hope you both are ok and he gets better and that maybe this email will help.