One of the reasons that a couple might do a questionairre type test, such as the Dr. Phil one, is to open up a dialogue by which they can communicate.
I didn't see that happening in your post. Did the two of you spend any time talking about the questions? Reflecting on one another's answers?
Maybe it's just me, but if you aren't doing that....the questionairre itself doesn't seem to have much meaning. These questions are a reflection of things you already know about each other, right?
You know, I've been of the impression for a long time now that you and MrsMLC need to work on your
communications together. I don't know how you'll EVER get that done without the specific guidance that you'll receive in counseling.
Afterall, if it was easily done for you....I think you'd have managed it in 35 YEARS!

The same goes for leaving her. It's been 35 years, you could have done that by now too.
It's been several months now that you've been mulling all this over, and you're still not risking any conflict with her.
I can't see this situation getting any better for you until you get serious about getting some emotional support. Let's face it, if you could do all this by yourself....it'd be done by now, one way or the other.