How frustrating for you purple - no real advice other than to say I had a similar (though less escalated) MH issue with my maternity notes.
Mentioned at booking in I had had issues with anxiety and depression in the past, and had counselling at my universities and a 'course' of online CBT in 2009, but no current concerns. Nothing more was asked or said about mental health.
Later on in the appointment the midwife said she would be booking me in to see a consultant. To be fair I should have asked why, but by that point she had taken my bloods and I hadn't had lunch, so I wasn't totally on the ball!
two months later consultant appointment comes up, I pop in and she goes to be "First thing, how are you feeling?" I say fine. She does rest of standard check-ups and says to me "Well, you're completely fine, I have no issue discharging you from consultant care"
I leave, picking up a maternity notes and then see, in black and white on the very first page 'Maternal Concerns: Mental Health Issues'
I don't know what I was more livid at - the stark and unrepresentative way my conversation with the midwife had been recorded, the massive waste of NHS resources by referring me to a consultant for a ten-minute non-event of an appointment, or the fact that if I actually had any amount of depression/anxiety issues, the course of action taken would have done precisely nothing to support me.
It's a joke, a far as I'm concerned - ticking boxes to cover their back, while the actual level of care and active support remains laughably low.
I think you have every reason to challenge this purple, but I can also see why taking it on the chin might be the path of least resistance right now... Good luck with everything in anycase