Waggers as PPs have said, you're fully protected by the law here. I would contact HR making an "enquiry" and casually mention that you felt like you were put under pressure by management for taking carers leave. I work in HR and would $hit bricks if one of our staff said that to me and the manager in question would be getting a swift kick up the backside. Any HR professional with half a brain knows about general protections and adverse action and wants to stay far, far away from any claim of that nature. I'm not sure how much you want to disclose however if you feel comfortable with it, I would let HR know about your mental health issues. That will protect you further as that adds another level of complexity regarding them trying to disadvantage you in any way for utilizing the leave that you're entitled to. Good luck.