Hi Lynn, I'm going guess these symptoms etc started before he started drinking? The thing is, if not, there is really no way to know and the fact that his medications have never appeared to work properly is an unknown too. Having him attend a facility is probably the only way you will ever know.
Does your Son have a psychiatrist? If so that is the person you might want to speak to about options, both for having him attend a facility and which facility might be the best in your area or elsewhere. You might find these articles interesting, written by Floyd P Garret MD:
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Addiction, Lies and Relationships
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"Addiction protects and augments itself by means of a bodyguard of lies, distortions and evasions that taken together amount to a full scale assault upon consensual reality. Because addiction involves irrational and unhealthy thinking and behavior, its presence results in cognitive dissonance both within the addict himself and in the intersubjective realm of ongoing personal relationships.
In order for the addiction to continue it requires an increasingly idiosyncratic private reality subject to the needs of the addictive process and indifferent or even actively hostile to the healthy needs of the addict and those around him. This encroachment of the fundamentally autistic, even insane private reality of the addict upon the reality of his family and close associates inevitably causes friction and churn as natural corrective feedback mechanisms come into usually futile play in an effort to restore the addict's increasingly deviant reality towards normal. Questions, discussions, presentations of facts, confrontations, pleas, threats, ultimatums and arguments are characteristic of this process, which in more fortunate and less severe cases of addiction may sometimes actually succeed in its aim of arresting the addiction. But in the more serious or advanced cases all such human counter-attacks upon the addiction, even, indeed especially when they come from those closest and dearest to the addict, fall upon deaf ears and a hardened heart. The addict's obsession-driven, monomaniacal private reality prevents him from being able to hear and assimilate anything that would if acknowledged pose a threat to the continuance of his addiction.
At this stage of addiction the addict is in fact functionally insane. It is usually quite impossible, even sometimes harmful to attempt to talk him out of his delusions regarding his addiction. This situation is similar to that encountered in other psychotic illnesses, schizophrenia for example, in which the individual is convinced of the truth of things that are manifestly untrue to everyone else. Someone who is deluded in the belief that he is the target of a worldwide conspiracy by some organization will always be able to answer any rational objection to his theory in a fashion that preserves the integrity of his belief system. Even when he is presented with hard and fast data that unequivocally disproves some of his allegations, he will easily find a way to sidestep the contradiction and persist in his false beliefs. (He can for example easily claim that the contradictory data is itself part of the conspiracy and is expressly fabricated for the purpose of making him look crazy! Anyone who has ever tried -uselessly- to reason with delusional patients knows the remarkable creativity and ingenuity that can be displayed in maintaining the viability, at least to the patient, of the most bizarre and obviously erroneous beliefs".)