Is it normal for personal life to affect work life ?

I’ve had a really rough yr and some months. It’s taken a huge toll on my work life as well. I feel like a zombie sometimes just trying to make it through work, I work for myself btw. So it’s even hard because the motivation isn’t there some days and then some days I’m super motivated and excited about life.

I’ve never been through this before until I got cheated on in my marriage. I know it takes time to heal.

But I’m wondering is it’s normal how I feel. Because sometimes I feel maybe I’m just lazy and making excuses. I think of how far I can be if I gave it 100 percent. Have you gone through something similar ?