Excellent post, Shane. I have been wondering what your profession is. It appears that you are in the medical field or maybe you are a homeopath or naturopath. His mother's allergic reaction adds to your prediction about possible alcohol/caffeine addiction. When one craves these things, it is often allergy-based. Also, if he did not eat well, there might not have been much food in his system to absorb the alcohol.
Also, many people have reported that OP has anger issues which when sober, he might be able to control. But when he starts drinking, the rage comes up and he cannot control it.
Among alcoholics one of the many irritating personality traits is anger. Dealing with an angry drunk is challenging. Coping with this disorder when they’ve been drinking is difficult. Even sober, the negative emotion seems to be dominating in the character of a regular alcohol drinker. Not all alcoholics are candidates for having the disorder actively working in their life. But it is a common thread among the disease of alcoholism though.
So was OP also a "rageaholic", or "anger addict" as well as a heavy drinker with an allergy to it? That is a person who gets excited by expressing rage, or a person prone to extreme anger with little or no provocation. While "rageaholic" is not a formal medical diagnosis, it has been developed as a lay psychology term by counselors and anger-management groups seeking to help people who are chronically angry and who compulsively express fits of rage.