So much of this sounds familiar--including the bad news coming in April.
There are some differences, like sleeping on the edge of the bed, the romantic songs, and his change in FB activity. My H avoided physical contact during the day, but continued to sleep with his arm around me.
So, I'm not saying that our situations are the same. I feel for you and your suffering.
You might want to change therapists. I told mine that I thought my husband was leaving me and I wanted to get through it without hating myself. She was immensely helpful.
I also can't recommend GAL and doing 180s strongly enough.
My H's main complaint was about our sex life, so I 180'd that, but I also 180'd lots of little things that he didn't mention but that I felt could be better.
And I emphasized trying new things in my GAL. Trying new things stretches you as a person and adds an extra buzz of energy.
No R talks. At all.
We started watching a TV show together so we'd have a low-stress way to spend time together and something to talk about that was impersonal.
I also recommend reading up on emotional fusion and self-validation. Don't look to him for emotional validation. Learn to validate yourself.
I would rethink the idea that you have to do everything as a family. Family trips are great, but so are solo trips. It's healthy to want each at different times.
Mine was receptive to sex at night, and our sex life was a source of tension before, so I personally kept having sex and initiated a lot. Your mileage might differ. I did avoid physical touch during the day, because I noticed he seemed to pull away.
Good luck!
Me: 44 H: 44 Kids: 20, 16, 16, and 10 Together/Married: 22 years H announced he was emotionally detached and considering D: 4/4/16 H announced he is going to try to stay and reconnect: 5/1/16