As I said before I will take all forms of advice, nobody on here knows me so a little bit of info,
I'm a 6 ft 17 stone bloke not a 'wet lettuce' type. I've spent my working life on building sites and in factories, in my early teens I had problems with 'anger' that got me into quite a bit of trouble, football violence etc. I put all that behind me and am very proud of the fact, I haven't been in any trouble since I was 17, the last thing I want to do is 'unlock the beast' in me again as I know where that will lead.
If I have to grow a pair then I will, but it's a fine line for me. I want to try the amicable way first.
After dropping her off I purchased a bottle of vodka which I'm looking at now....
Just keep looking at the vodka with the top on see it as your beast not to be unleashed. I had a huge reactive depression after a similar spate of life kicking me in the bollocks until they were black and blue all over, it probably won't feel better any time soon and while the balance of your rational thinking is affected, standing up for yourself may well not come across to others in the way it does in your head, you are wise to be cautious IMO.
You need professional help and support, psychologist, not psychiatrist and; with proper control and exit strategy from day 1 agreed with your GP; anti depressants aren't necessarily bad, they will take the peaks of heightened emotion off and allow you to keep your thoughts in some semblance of order and control as you work through your feelings and the practicalities of a) trying to resurrect your home life & b) fighting your mates for your job & salary (me too right now & not 1st time) or if it comes to it, dismantling your marriage & getting down the job centre.
Whichever way life takes you, you need to be able to think through it with some degree of clarity & rationality or you really will be screwed, use the tools and people available to you.
GP discuss chemically managing your temporary emotional extremes alongside...
...GP / Occupational Health at work - one or the other to get you a professional ear to help unknot your mind.
Union Rep &/or trusted manager 2nd ear to hear what work is saying about redundancy and talk it through 1:1 so you're not getting the practicalities tangled in the emotions & you can defend your position most effectively
Solicitor - forewarned is forearmed, Mrs doesn't need to know but her bombshell already has you on the back foot, solicitors will be on with this stuff all the time, another way you can be sure the practicalities get taken care of while you just want to curl up into a ball and cry, because life isn't going to stop moving.
You're not surrendering anything, just letting people help keep an eye on your interests while you need a little1:1 time inside your own head coming to terms with such massive bombshells.
You talk about your kids as if they are 6 not 20+ & from the brief info they seem to be normal young adults starting to make their own way in the world. Give them the facts reassure them that no matter what happens with you & Mrs and you & work you still love them & will be be their dad/pal etc and how tough you are finding life now (as far as you want to, but don't spare them the truth that you are a human being with limits just like us all) and trust them to work it through themselves.
Frankly you need to lean on them no less than you seen to think they'll want to lean on you when it all comes out & where they get to live in the future is a low *practical*consideration for you in what you're facing right now. They'll very likely surprise you with their resilience.