Sonya Mitchell eventually collapses after her evil ex Troy interferes with her relationship with Toadie.
Morey told TV Week: "Things have been unbelievably full on for Sonya lately. Just reading the scripts, I was stressed out! What happens this week is a nightmare.
"Sonya sees Troy as the devil incarnate - a man who has only ever wanted harmful things to happen to her.
"He really epitomises the blackness of Sonya's past and he's affecting everyone she loves."
Matters come to a head when Toadie (Ryan Moloney) punches a taunting Troy in the face, which prompts Troy to take out a restraining order against him.
Morey added: "The news that Troy's taken an order out on Toadie is the final straw. Sonya's in the first trimester, which is the most vulnerable time.
"It was so difficult for Sonya to fall pregnant in the first place, but now her body just shuts down because of the enormous amount of stress she's under."