@MyJackieD I'm so sorry this is happening to you.
You are me a year ago. 24 yrs together, couple of kids.
Small things - eat and sleep, are you doing either? Eat what you can, when you can. Sweet drinks can help when you need some fuel. Sleep - if you struggle, try and sleep mediatation track and any helpful routines. I really struggled, for a few weeks 4 hours sleep was an achievement, worst was 2hour 12 mins. I had sleep pillow spray, a sleep balm for my wrist, feet, temples and I took nytol.
Meditation - I didn't before but its been a game changer. I use a free app called Insight Timer and its full of free guided meditations. Find a sleep one you like and when things get too much try and take 2 mins on one in a quiet spot.
Everything you feel is ok to feel. Life is going to be really awful for a while, gut churning, whirling different world. You will cope, you will get through it and its so hard to imagine what that looks like but trust that it will.
The kids - I was honest and child age appropriate. I did it all, he wasnt involved as the choices he was making at the times meant I didn't trust him. I told them he didnt love me anyone, he had met another woman who made him realise he didn't love me and I really stressed the different love that adults have to paternal love. They know its not about them, its between us two. At the time it was such a sad experience, me and kids all in tears. But now I look back and realise that is was the beginning of us being a really strong unit. They saw me cry, I saw them cry, we hugged but we also got on with our lives and we have lots of fun!
Admin - if you can, understand the financial situation. Do you rent? Mortgage? Work? Understand the values in and out, what the committments are and can you make it work without him? Look at Universal Credit as soon as you can as they dont back date.
Legal advice - ask around for any recommendations or look at the Resolution website. Get an idea of who you want on your side when the time comes.
Its awful but you will get through stronger than you realised possible.