Our biggest issue is balance in anything. Emotions, relationships, vices, work... It's all extreme somehow. I've been working with my BPD a long time and the only way to truly be the ruler of my own life is to throw myself into the logic pool and suss out all the issues, trying to ignore the emotions telling me, 'You're having relationship issues... therefore this relationship is suddenly wrong. He doesn't love you. He hates you. This is wrong' Just from everyday issues. It needs to be meet on the battlefield and confronted.

You may develop different coping methods... but you need to work towards finding some.
Dealing the the aftermath of emotion isn't enough to build a fulfilling life with this disorder.

You need to be able to pull yourself in half. The BPD side, and the rational side. Normally, hopefully, they exist as peacefully as possible, but when things go south you need to pull them apart and look at them side by side on the big and the small issues. It's a way to gain perspective.
You absolutely can take a hold of black and white thinking. Just try. Stop a conclusion before it's verbalized, and pull it apart.

And you absolutely work too much. Not to be general, but the stress of over 50 hours a week is insane. I don't know your work history and financial situation, but are there better options for you out there? You should take a look around and see, just look. No need to leap into new life changes, just see if there are better jobs in the world that benefit your health.

Your number one priority in the world must be taking care of you.