Everybody feels like that after the death of someone close. Hopefully it won't happen to you and everything will go well for your mum. Best wishes for that.
As for Single Father, as I am a big Tennant fan I was looking forward to it, but it didn't engage me as much as I expected, though I thought the acting was good, including the kiRAB.
I thought the whole "what happened the day before" thing was unnecessary and slowed up the story. The characters also seemed a bit stereotypical.
I'll certainly watch it next week, when it seems to be going to be a bit more intriguing.