ASA, I'm so sorry. I know how you feel. My H is still at home but similarly wall-like. It's awful. I try to act "as if" but I don't always succeed. Do you have the Divorce Remedy book? It explains the techniques very well. I also struggle with how to do the 180s and stuff, so I'm not much help there--but I just wanted to say that I and many others here know how you feel. So in that sense you are not alone.
Me/X-H: 47/48 T 19 yrs M 16 years D14 D10 ILYBINILWY: 10/07 H moved out 6/08