And as her anger worsens, Cathy takes it out on Wendy.
When Cathy is officially diagnosed with PMDD, there's relief all around and whilst Bob is sympathetic to her condition, Cathy feels disappointed and desperate when her treatment is to manage her symptoms instead of an outright cure.
Back at the B&B, an upset and volatile Cathy blindsides Bob by defiantly insisting she wants to find a cure to stop her PMDD symptoms. Despite the best efforts of Bob, Wendy and Bernice, Cathy is unrelenting in her desire to cure her PMDD.
Later, during a heated moment, Cathy throws a garden ornament through a B&B window, just missing Manpreet. When Wendy tries to intervene, Cathy takes her anger out on her, and shoves her to the ground.
Running to help, Bob feels a twinge in his chest. As Manpreet checks Bob over, Cathy's concerned to see her dad struggle. When Wendy tells her to leave him, Cathy runs off, bleeding from a cut on her hand.
When Liam finds her at the Bandstand with her hand bleeding, Cathy begrudgingly allows him to look at it. Reluctantly, Cathy appreciates Liam's promise to listen to her but soon jumps to conclusions.
Emmerdale continues Mondays to Fridays at 7.30pm on ITV1