Your kid is a nightmare?

Your kid is challenging?

Your relationship with your wife has been wonderful before and after what? The birth?

I am in a challenging marriage. I have young kids. My kids are wonderful. I am trying to work things out with my wife for my children's sake. I would be careful with the language you use to frame the problems in your life. How you describe your problems may influence what you see as the solutions.

Are you sure it's a problem with your child? Maybe it is a problem with you and your relationships?

Anyways, good choice being in therapy. A competent therapist will help you unravel your problems better than some asshole on hn (that's me).