you also 'waltz off with half the assets' yay! and freedom thats. you have already 'burnt your bridge'? didn't you already issue divorce proceedings by handing him the letter personally?
How can you 'make' someone into something acceptable? surely thats what he's trying to do to you?!!! 
This: I know I shouldn't care about him (and I don't really) you acknowledge that you don't care about him, so why go through a year down the line staying in different houses, etc.? You cannot 'make' him anything!
Its hugely scarey to really properly let go of everything, but actually you are grabbing hold of so much more, you are grabbing hold of life! of independence, of treating yourself in the way you deserve and not playing slave to some abusive FW.
it doesn't matter what your job is, your happiness is worth so much more and happiness doesn't have a price (corney, but true), would you say you have happiness now? Want for more for yourself. yes, you will have to start managing the pennies carefully, oh but hang on you will have half of all the assets?! Surely you actually wouldn't have to worry so much?
You need to talk this through on here, and with others, but not your DC, even grown up DS. He should not be your sounding board in this, you are both his parents. Please don't share this stuff with him? Like how his father is this and that, and what you will do financially. Just sort it out direct with his father. That bit sounds codependent upon your DC.
Colliewobbles a plenty, take this leap of faith that all will be managable by you. YOu have done it already, but just need to stop talking to him!
thinking of pony 's 'stoppit' 
Another bad night of sleep here and now so tired, how long is everyone taking to get over decades of abuse? I am still realising that i don't know how to think straight without being scared of his 'consequences'. Oh and he's taken to intimidating friends, yesterday he followed a friend of mine into her bank (well, yes, it could be his bank) but he actually stood behind her so close as to be touching leering over her shoulder - she blanked him completely and refused to engage in any way - thats the way!!! - so he started shuffling and coughing, she just carried on to the teller position and walked out without a 2nd glance or any acknowledgement to him at all but does anyone else out there have this going on after they've left?
Am i amking something of nothing, or should this be a worry? Why does someone actually do that - why are my friends important to him? Thankfully most of them are now people that he doesn't know at all, so can only intimidate from afar (or up close it seems!), he seems to have 'turned'the rest. He's such a lovely unassuming funny guy, and i'm such a controlling bitch blah blah ... oh I am tired! 
oh and we have had the most weird things going on with our phones over the last weeks. First I couldn't reach one of my DC nor him me, then another couldn't use their phone at all. I haven't been able to pick up answerphone messages and when people ring me its always 'engaged' - this is my mobile? its NEVER engaged! The same was happening with DS phone, but that then stopped. We all have the same provider, but with different phones, and decided we'd all swaps SIMS around, and the SIM seems to share the problem! Until the phone was switched off away from the house and restarted, then all worked, but as soon as returned home the same again, mobiles engaged and cannot pick up answerphone messages. One by one all the DC phones have returned to normal, but mine not. So i have to park up away from home and pull the battery, restart phone and i can get messages and DC/others can ring me. Everyone i spoke to has never heard of this issue?! Don't even know where to begin with it, as the provider has no idea what i'm on about, but mine is still doing that 'buzzing' thing soon as i get near to home then the signal goes wonky and bang, back to square 1. Any ideas... anyone...?