I don't think he did see it coming. Anything not of his making, outside of his control, doesn't exist.
He's probably shocked to his boots. This does go in your favour, Wait. If my (very similarly controlling) ex was anything to go by, he'll be in shock/confusion for a short window. Shock and confusion that there is another world that exists that he didn't make in 6 days, resting on the 7th.
Use that window, it buys you time. Iiwy I wouldn't go through that ridiculous schedule, it's all probably rubbish anyway; plus it'll be an opportunity for him to weave threads if gossamer around your head (and heart), make you look stupid, inept, ridiculous, worthless - it's what he gets off on, after all. If he brings it up, say 'later' or similarly non-commital things. As Stacey says, if you have to speak to him, speak to him in general terms, non-commital "hmm, I see' 'OK' etc - and no more. Try not to feed into dialogue.
Other agencies - FP (of course!), Women's Aid, lawyer. Book lawyers now, first half hour free - see a few, get a feel for them, see who you click with. They get through an amazing amount in half an hour and you will come away with a very clear picture of what (%ages) you are to expect financially. If you want to give some indication of what's been going on you could say that the finances haven't been evenly distributed throughout the marriage; you've been kept in the dark, even though on paper you have been utilised to avoid tax a part in the business/es though you have no idea what that part is. But you don't have to tell them this if you don't want to - however, their interest will be piqued if you do because they'll want to get the bastard . I cried throughout my initial sessions so don't worry if you do, you won't be the first by far.
Tell your GP frankly and openly what is going on: that you have been controlled to within an inch of your life throughout the relationship and you now see that the depression you were treated for some years ago was in fact a direct result of the controlling tenre of the relationship; that you expect things to get rocky in the months ahead and need their support; that you want them to keep an eye on the kids.
I'd also give a heads up to the school/s that you are negotiating a separation and to watch out for the kids. You may want to go into more detail but be wary of this as you may not get a sympathetic hearing - however, your H may cause problems at the school in the future so you may need to flag up his controlling nature to the school.
I'm liking the new tone to your posts, Wait! I can see some steel glinting through. Wait to go.
I'm not being triumphant here. I know from experience how sad this time is for you.