Sometimes I think we mistake peace for boredom. And being alcoholics, we are used to a lot of self-created drama and big highs and lows. When we start living life right, we get peaceful, but it feels so foreign to us, we don't know what to do with it, until it becomes the norm.
I am over nine months sober and I remember around six months feeling the same way you do. Get busy doing things that you like to do. Pray for help if you are so inclined, but know that this will pass and sober life is wonderful!