When you say he's been diagnosed, do you mean by a psychiatrist
, after appropriate evaluation (including testing and, if appropriate--and it often is--interviews with you to "fill in the blanks")?
An IC is NOT qualified to diagnose bipolar disorder or schizophrenia.
OTOH, ICs are often led down a manipulative path by certain clients, and nothing tops the list of manipulative like addiction (of any kind).
I agree, inpatient rehab and extensive PSYCHIATRIC intervention are a great idea.
If the diagnoses he's facing were not made by a psychiatrist, I would hold off on assigning them just yet; active addiction can cause illness that mimic others.
That's NOT to minimize the severity and impact of alcoholism; I grew up with alcoholics, and truly do understand.
With sobriety, some of the other things will become more clear. It's very difficult to do a good psych eval with an active user.