No real experiential advice having not had the same set of experiences, but I'd say that a therapist isn't a bad idea for your kids. Part of it depends on whether they want it, or whether they need it. Having an educated person for them to talk to with no fear of reprisal for "saying the wrong thing" might be comforting.
As for them spending more time with their Dad, that's good if he wants to spend time with them, but it shouldn't be motivated by anything you do, such as "finding yourself". From the sound of it, you've already found yourself.