Worrying becomes a habit and it is a difficult one to overcome. I use to worry about my alcoholic mother, she is almost 86 and has been drinking for for over 65 years.
I finally had to let go, I was worrying about her well being and all the time she was tossing em down...I finally woke up and turned her over to my HP, and moved on with my life. I cannot control her bad choices and what happens because of them, it will happen whether I worry or not.
You have programmed yourself to worry when he is drinking, what did your compulsive worrying change...25 years later? My guess would be...nothing.