I would say, based on my experience, that the best thing that you could do for him is to just listen to him when he wants to talk and let him understand you know how hard it is for him. It is a hard time, finally finding something that works for you and then having it taken away. Focusing on the light at the end of the tunnel is a really good thing. I was fortunate enough to have one person who really listened and let me talk and it made a difference in coping for me. Also maybe you can do things like get areas of the house ready for him in advance together? Hopefully he won't have to wait too long in between and can get the surgery scheduled quickly!