Divorce, custody, and my mental health in the aftermath

Been a lurker but feel like I need to post this. Finalized divorce last month, custody is 50/50. Was doing okay for a minute but now I'm really struggling with the loneliness on my weeks without the kids. The house is too quiet. I feel like a failure (even though the marriage just wasn't working). Taking it week by week. Just wanted to see if anyone else has been through this and come out okay. Also considering a therapist but idk where to start with the logistics of it.