I completely concur with Wifey.
One of the thing covered in DR is that you have to figure out what time of day is best to talk to H about anything, even the kids. Unless S is bleeding or something is broken, you have to pick the best time to get that conversation taken care of to get the most out of it.
Something I try to work on....I try to imagine him as just a friend. If this friend didn't call me back, I would be ok. I might wonder, Hmmm, hope they are ok, but otherwise assume they were busy. If this friend couldn't talk when I called I would say Ok, catch up with me later. If you can put him in that capacity, it can help--but I know it's hard. There are days when I can't. But I think I'm getting better.