Struggling with Parents Harshness in the Name of Islam

As-salamu alaykum, I'm a young woman about to start university. Because of serious health problems that had me stuck at home and needing surgery during my last year of school, I didn't do well on my final exams. I've always been a straight-A student, so this was a shock to everyone. My medical situation let me still get into university, but my parents have been really harsh with me and say it's for religious reasons. I can't defend myself without them calling it 'uquq al-walidayn' (disobedience to parents). I truly haven't been disrespectful, but they insult me and my father sends me angry messages while at work saying he's disappointed and other hurtful things I won't repeat. They keep reminding me of all they've done for me, and I feel like screaming because I've tried so hard my whole life to please them, and they say my best isn't enough. I'm so tired. I love them, but it's hard to be around them. They're always criticizing me and say it's their duty as Muslim parents to raise me better than them, which makes me wonder if I deserve this. But it's so hard being their child. Since exam results came out, there's a new rule every day (like I have to text them before and after everything-sleeping, waking, showering, etc.). They always think I'm lying (but I'm honest, wallahi) and say I bring shame to the family. I'm still recovering from my health issue, so I can't leave home much to get a break. I don't know how to stand up for myself without them saying I've violated birr al-walidayn (kindness to parents). I'm exhausted. Any advice is appreciated.