I know from what I read on here that divorce proceedings have moved a pace fro when I found myself in your situation, but with a baby rather than adult children.
This is what I did 40 years ago....
My ex2be wouldn't let me in to get any of my stuff - mortgaged house, both on the deeds. So, I got me a van with some friends, waited at a friends house just a few doors away and watched him drive off to work for the day. Tried my keys in the door but he had changed the locks. So I broke in through a poorly locked window, collected all my gear and off I went. On returning home he saw what had happened and called the police, but on learning I was part owner, they didn't want to know.
I was lucky enough to be offered a council house, but need the money from my share of our joint house sale to furnish it properly. However, even though we were having plenty of viewers, no one put an offer in. On asking the estate agent, it seemed he was telling lies about the house, that it was in a poor state, with terrible neighbours, etc (they were lovely by the way) , to put buyers off.
One of my friends was a builder and he offered to pose as a buyer for my half of the house. I couldn't refuse as things were desperate, and so he went round it with the ex saying he'd be taking out this and that wall, and doing other xyz things to it before moving in himself and his family.Apparently, the look on my ex's face was priceless. Before making an offer my friend said needed to get some plans drawn up for the bank etc, etc and would be back within a few days. Said friend was a really convincing talker, and before I knew it the house sold in full to practically the next set of people that came along, and I got my money, to buy things like y'know, proper beds to sleep on, and chairs to sit on.
Me and my baby were living without even the most basic of comfort (we slept on a mattress on the floor, and sat on the floor when not sleeping, and that ex of mine didn't care a jot, He had his chesterfield sofa and king size bed - he was 'alright jack'! So I had no qualms doing what I had to do.
Would I do it again today? Yes, without a doubt - but not climb through a window as I'm now a tad too old for such shenanigans. So to you OP. Get angry, hire that van, get that locksmith, gather your friends around you, reclaim your life and break free of him.
As a PP said, take back control.