T - just offering my support for you. Cali (and everyone) is giving you great advice as he has given me.
I see very many similarities in our situations. It is great that you found this forum early - start applying these DB principles now.
My W is also in an A with a coworker and I spent the first 6 months floundering in a devastated way - made every mistake - health was failing, couldn't function. Found DB and poorly executed and slowly implemented these principles. I believe that if I truly took all of the advice from the books and fine people here quickly, my situation may be better - who knows. But I do know that I am better for it (DBing, not the whole sitch) - I am stronger because of it. You will be too.
I'll be back, but wanted to give you my support.
Have a great holiday weekend - it is possible.
Me-45 W-44 S21, S18, D15 T-27, M-21 BD Jan 2014 PA revealed March 2014 In-house separation - April 2015 I filed - Aug 2015 She moved out Oct 2015