It looks like one giant barrier to your healing is that your H won't talk with you about his A.
The free download Help for Therapists (and their Clients) on Peggy Vaughan's website may help, if either of you are readers.
It's an easy read if you stick to the statistics, and the statistics are pretty clear - the more couples talk about the A, the better the outcomes.
Also, Shirley Glass's NOT "Just Friends" has a lot of great information. I urge you to get a copy.
A second big barrier seems to be your shame. Your H betrayed you because of his own issues. You did nothing to deserve betrayal. His A was about him, not about your or your M. It was his failure.
But the sense of shame you feel is normal. I'm pretty healthy emotionally (if I do say so myself!
), and none of my friends know about my W's A. That's partly about shame.
You know what? That's OK. I'm healthy, but not perfect. I feel some shame where I should feel none. So do you. If you stick around, you'll read that others do, too. So be it. You can find joy again, even so.
But healing is a long, hard journey. You're at the start. You seem to know where you are. You seem to be standing up for yourself. You seem to be creating boundaries that will help you.
All of that is very positive.
Even the feeling awful - sad, mad, scared, ashamed - even feeling those feelings is very positive for your healing.
Being betrayed is traumatic. It's a giant blow agains one's self-esteem. Healing is processing the feelings that come with that trauma.
The SI rule of thumb is 2-5 years to recover. I think it's fair to say that you'll go through a period of a few months in which you spiral downward as you take in just how traumatic the A is. That may be followed by a very low plateau in which you gather your resources and process some of the pain out of your body. Then comes a slow improvement in your mood, an increasing awareness of your strengths.
You say you're looking into the 180. If you want to R, you need to communicate with your H. The 180 limits communication. Also, the 180 is not a tool for manipulating your WS back into your M.
What's your goal for the 180?