Congrats on your sober time! You are doing great work.
I do think the mood changes are normal. A lot of us are all over the place initially. The "newness" and feeling like we are on cloud nine wears off and then we get down to the real work of day to day living. Some people say that it takes around 3 months to level out and feel like we have our sober living legs moving in the right direction. Keep moving forward! You got this.