Nah, you ain't crazy. Or at least, you ain't alone
You've got a plan, you realize it will take time, and you're willing to pay your dues. Sounds to me like you're being quite reasonable and sensible out wanting to become the best you can be. My only word of caution would be to remember the old adage about the grass not being greener...
Any path we take will sometimes be strewn with obstacles and difficulties. That will be as true of your life as a career woman as it was of your life as a soccer mom. And leaving a marriage is always a HUGE undertaking.
About those middle-of-the-night occurrences, well, I'll bet if you surveyed this group, you'd find a bunch of are up then. Often, for the same reasons.
I don't even pretend to have all the answers, since I'm afraid I DO know recognize that overwhelm mode you're talking about. However, if it's any help, the one thing I keep in mind, always, is that it is better to be moving slowly TOWARDS the future, then blindly running AWAY from the past.
Sending you hugs and reassurances that this will not only pass, but you will be better for it!

Fifty