Your matter very complicated and not suited for a quick answer in this forum. You need to seek out the help of a family law attorney.
I can't even tell from your question what you dismissed. It sounds almost you ended proceedings and are still legally married. Also, res judicata as to what issues? It doesn't sound like anything was ever decided by the court.
First, the firm is a debt relief agency according to the U.S. Bankruptcy Code. We help people file for bankruptcy. We also do other stuff and we do it well, but Congress wants me to post this notice. Second, nothing on this site is legal advice. You are not my client unless you enter into a written agreement signed by you and me.
I agree that you really need to talk with an attorney face-to-face for a free consultation Use Avvo's Find a Lawyer tool
The information provided in this answer does not create an attorney-client relationship and is not considered to be legal advice.
Souinds like both are playing games. Resjudicata will not apply. But it is best that the two of you decide what is best for the child rather than plan these procedural games.