Note my user name... .drained... .I feel your pain! Try to be compassionate with yourself, as you know, you've been through very trying times. You own the right to be and feel as you do.
I came to this same moment in my own relationship more than one time.  :)isappointed in myself... .because I felt I could not go on... .
Ultimately I had to look each time and decide for myself. What is the best decision?
What do you think is the best decision? What do you want?
Hahaha, yes that was the first thing I said out loud when I read your username... .Drained!
Thank you for encouraging me... .It does help to know that I'm not alone, that others have come to the place of brokenness where they feel they nothing left in the tank to give.
As a believer, I've always turned to God and He has been faithful to give me what I did not possess. He took over and loved her through me when my strength failed. This time it's just different and that bothers me. I know it's not Him either, it's my capacity to receive and then pass along. At the same time I know that He understands and is compassionate not judging me for my condition. The God card just adds another element to the situation that has it's own issues to work out.
All that I know I want at this point is to have peace. Not having any peace in my home the past several years has taken it's toll. I am in a job that is very demanding of me and requires lots of giving of myself. Then to come home and not only not have my sanctuary but to have to give more and more has brought the burnout. It's like you meet the challenge but there's always going to be one more hoop that you missed and have to pay for now.
I have always had jobs and career paths that were successful in fields that demand an outgoing personality. I have always thrived in collaborative settings and with crews of co-workers that can challenge one another. These days my thoughts turn to staring over on my own and getting a CDL and just getting away on the road.

... .Or working a job where I have ear plugs and a machine and I work like a machine. How crazy is that? I get it that there's more psychological going on to make me have those thoughts but that's where it come to.
Has your life changed dramatically drained?