So I presume you meant bipolar disorder and not borderline personality disorder.

I have disclosed previously. And I have a senior level, upper management, leadership position. The only time to disclose is if you need accommodations. It does not sound like you are requesting accommodations. You just feel pressure because you can't go above and beyond, even though you are performing at a satisfactory level. It sounds like you feel guilty because occasionally you take sick days (and you are sick even if it's a mental health disorder) and that you should have to explain. You know very well you do not have to explain. I have had to request accommodations, and even though I only disclosed to HR, everyone knew because I have a service dog. And I assure you having everyone know is not fun. Even just having HR know and your boss know, if they aren't understanding, is not fun. But regardless, I know we want to end stigma, but there is no reason to disclose any personal information including health related, if you don't need to.

If you do need to ask for accommodations, like more sick days or time off, or not meeting quotas, then I would disclose. But FYI, disclosing will not change anyone's opinion that you are lazy or not doing enough.

I hope this helps.