madgered I am so sorry you are going through this
My XH left 3 years ago with an OW lurking in the mix after 17 years together and I was heartbroken for a while. I am so glad I wasnt on MN then listening to people telling me to move on, forget therapy,get to a solicitor immediately etc.
It took 3 months before I was ready to go to a solicitor and start thinking in legal terms.
I spent a lot of time reading self help stuff, saw a therapist basically did everything in my power to move on but it took time and patience with myself.
I was more or less a SAHM for 15 years and knew in my mid forties I would have to get back to work and fend for myself.
I did some back to work type courses including a decent level computing course and getting my maths GCSE .
I am back working FT this past 18 months in a low paid job but knew I had to start somewhere.
Its been a journey with some real ups and downs but once we had moved house, sorted our finances and I began my new life I am actually happier than I had been for some years in my marriage.
The early months are very difficult though and unless someone has been through it themselves they have no conception of how hard it is