If I switch lawyers, they refund the amount of retainer that hasn't been used to my checking account.
You can approach divorce any way you want. That's a good question to ask an attorney. Usually custody of the children ends up causing massive battles. Since you don't have kids, it's a division of assets. Filing creates a monitoring or safety net on bank accounts so the other person can't drain it with unusual expenses.
Make sure that taking care of yourself comes first when you're meeting your objectives.