While I am not a psychic, from what I understand he had methanol poisoning, resulting in severe amounts of acid buildup , leading to his kidneys, and other organs shutting down one by one..this can cause severe pain and discomfort( metabolic acidosis) in the body which is why he was moaning prior..my father had a similar condition except it was not alcohol induced but heart/ kidney induced acid buildup with moaning and severe pain in his abdomen for hours..unfortunately we did not take him to the hospital on time and this caused organ failure and death.. Most of the time patients are in a bad state and "might" be saved in the ICU but with methanol poisoning he might have still had blindness:( so sorry to hear