Dear C. I am happy to see that you are trying to locate some great help. It looks like you have truly educated yourself on the subject and at this point know more than the average accountant and lawyer out there...go get the best:)
How ever you are on an awful rant honey..husband was all great forever, suddenly turned ,worse shape now , on and on.
You will not be able to re invent your self by completely asigning him cause and responsibility over the demise of your marriage, and the last yearand a half of your life along with your stats on the 5 to 7 year to get over it... which truely is like a death sentence for you being you are already in your fifties... time to change your tune warrior woman!
For your own sake and survival please try to locate something that you did to cause this demise, look at it accept it, find something else so on and so on. Stop trying to solve what has happened to you by inspecting his "ball park", look in your own, there you actually have a chance at changing things. where in his you can't get any relief or understanding
Then realize that this is YOUR life, and you know how to handle the hell out of your life. Then go do that WITH OUT shame, blame or regret...finish it, gracefully
Now, go get laid/romanced...you need to replace him asap,move on or you will really become a ranting raving bitter woman , unable to inspire your daughters to fall in love and go with the flow of love.
I understand, i've been there, it was gross, now I am thrilled to live in the present, with my soul full of desire and joy and a curious new fella by my side.
Get to work my friend, stop blaming start living!
H.