You make it sound like the mental health diagnosis is something you're ashamed of and feel is a black mark against you. Whether true or not, thats the way it comes across.
Compare that to something like:
This way it comes across as more of a personal situation than something you're ashamed of.
I am by no means meaning to come across as I have all the answers for you, as I don't. However, I do know that tone and presentation can be the difference between drawing attention to a situation vs making it a non-issue.
And yes, I can completely get not wanting to discuss a mental health diagnosis.