How does Macbeth show remorse immediately after the murder? How does Lady Macbeth encourage him?

Immediately after the murder, Macbeth puts on a bit of a performance. He should have got an award for overacting but it seemed to have done the trick. He laments that nothing in life is worth anything now that Duncan is dead. 

Had I but died an hour before this chance,

I had lived a blessèd time, for from this instant
There’s nothing serious in mortality.
All is but toys. Renown and grace is dead.
The wine of life is drawn, and the mere lees
Is left this vault to brag of.

 Lady Macbeth basically faints to show how terrible the act sounds upon a woman's ears.