You can do this! We can all control our thoughts by redirecting thoughts that are not productive to something else and we can definitely control our actions. If you don't want to call, etc., just don't do it. If you find yourself thinking about whether he is drinking, direct your thoughts somewhere else.
One thing I find very helpful when worrying about my AH is visualization. For me this involves my visualizing what I mean when I say I am letting go and letting God. I picture my AH inside a globe into which I stuff all my concerns about AH and from which those concerns cannot escape. I then picture God holding that globe in His hands, symbolizing for me that AH is in His hands and I can let go all those concerns. Anytime those concern try to leak out, I shove them right back into that globe and remember it is all in God's hand and I can let go.