Why am I having a harder time regulating my mood after I stopped drinking?

I haven’t drank alcohol in almost 3 weeks.

My PMS mood swings are the worst. I get super impulsive thoughts about wanting to quit.

Also, I just am a lot more all of the place.

I did stop taking Zoloft so I could focus on quitting alcohol. But I was only on Zoloft for about a month anyways.