Sorry to hear about your situation.
Welcome to the Corporate America. It is a god dam mess. It will not get better for you because these companies (all of them) view YOU as a utility, and not a human being. I was at this game for over 20 years, and recently left to pursue a career in teaching. My new career is not perfect, but with my Masters in English, I make close to 100K, and I get 3-4 months off. Great deal. They key to teaching is to find the right school, in the right community.
Back to B and L, well, that place has to be one of the worst situations you can put yourself in because the stress you feel is REAL, and the cortisol build up with shorten your life. It may even lead to a heart attack or worse. So, I would not ignore your stress and I would resign if you can, immediately (if you have ample supply of money, you can do this) or when you have a good career plan in place. My friend recently quit after about 15 years at Pfizer, to return to his career as a pilot. It gets to everyone, this corporate nonsense. The ones that survive are likely psychopaths that have lost their heart. They are corporate robots. Don't be like them.
I would add one more thing, if you don't or can't quit: "trying too hard makes you look like an amateur". Remember that quote. Don't ever try to hard working for another company or person. You will never please these psychopaths (read Snakes in Suits), and you will look and feel like an amateur trying to do it.
Life is as easy as you want it to be. You are in control. Life does not have to be difficult. Buddha was wrong!
Best to you. Keep us posted. Don't quit. It will get better. You have options. And, I would add that a person like you has a great mind and heart to understand that these companies (and there are no exceptions in the Fortune 500 world) don't care about you. They only care about themselves and profit. Never forget that.