I see several posters mention its ruined their career, can I ask how?
Well, it hasn't, quite, but it has pushed it into a backwater that I have to weigh up philosophically, and that requires a strong pillar of acceptance (or resignation, more properly).
Reasons for this include - and this is in an individual case, but from the info from various quarters here, it's not a totally outlying one:
Time spent on periods is unpredictable. If you are late, then the mental symptoms can ramp up for a week or 2, which include severe anxiety from out of nowhere, that then subsides when it's ready. For me it seems as much physical as internal, such as spasms down the base of the spine or a restless leg, when you know there is a demand (travelling - in particular; meeting; speaking...) on the horizon that in normal weeks would be nothing unusual. You can't control this.
While experiencing your period, I also find that instead of steady flow, incredible flooding can take place unpredictably and on and off over a few days. This is ok if you can run off to a loo when needed, but now imagine standing up from a panel of people or even from an office chair in the above meeting situation, and finding chair and clothing is covered in a lot of blood. You have to have a very tough hide to be able to style things like this out. You can't control this either.
The flood of blood has also made you lightheaded and you wonder if you're going to be sick. Travelling, this can be quite a problem. Can you control this? No.
You used to get bad headaches around period time, when you weren't menopausal, but thankfully, in one way, these have stopped. Instead, though, you have some times in a month when hormones trigger certain scents (perfumes, food and bleach, for example) to be very, very strong in your nose. Three quarters of the time this still doesn't happen to you. But if you think you're in danger of being sick in the above situation, then you are aware someone in your vicinity is wearing strong perfume and you cannot move away, what will this do to your chances of actually puking? Control of situation and appropriateness for also working unaffectedly? See above.
Finally, for a lot of the month, not just the 'hell week', you will go to sleep but will be woken by whatever happens to your body at 3am, night after night. Can you make that back up somewhere? Maybe, but...you.can't.control.this, and you have a job to do in a few hours.
Is there medication? Yes, but it takes time to get it and time to balance it. You know it may make things worse before it fixes anything.
Is this forever? No. But it could well be years, not 9 months like being pregnant.
Does this give you an idea of how it can erode your career and your confidence?