Over the coming weeks, Bianca suffers postnatal psychosis after prematurely giving birth to her son with Heath.
Gormley told TV Week: "There were days where I would want to cry and get home from filming and just want to sleep.
"But I love that they throw these things at my character because it's important to tell stories, and these stories aren't always pretty."
Teasing the storyline, the actress added: "There's a lot of denial and Bianca is convinced her baby is dead and everyone is lying to her. In her mind, she's fine and there's nothing wrong with her, but unfortunately she's actually very sick.
"Her family and friends don't really know what to do. It's meant to be a really beautiful time in their lives, but sadly she's not in the same reality as them and they're worried and want her back."
Postnatal psychosis, often confused with postnatal depression, affects one in 1,000 women.