I'm probably not the best person to offer relationship advice at the moment but if I could hold your hand I would.
I left my husband after 17 years together and it was a very surreal experience. I still loved him but it felt more like brotherly love as opposed to how I wanted to be loved. The first couple of weeks were very strange he would cry and cry and scream like he was in agony. He would get drunk and call me up wailing in heartbreak it was truly horrible. But like you say I knew nothing was going to change.
We had tried and tried and even had marriage counselling. However nothing worked. He was still like my big brother.
Anyway he moved out and things started changing. The whole dynamics changed within 4 months and all the promises, commitment to each other that we would always care for each other, the helping each other move on turned on its head. He remained thinking he would one day get back with me. However I had to be blunt and move on.
Sadly 2 years on I'm still going through a divorce.
But it doesn't change for one second that it was the right thing to do.
Get yourself out. Get a hobby, invest in yourself. Go to the gym? A club. Whatever to take yourself away from the situation
I hope you feel better soon. X