Hi Niobe,
Read Dry Drunk Syndrome,and that if anything similar,this is hard to see if you have only known him a short while.
I knew it well as my XAH was in and out of it for years,and can be as bad as living with an active alcoholic,some may disagree, and I could never understand why he was never happy,moods all over the place(Dry Drunk is someone who is never truly happy with sobriety)
Just a thought
Happy Thanks giving
Jose2