I've been doing 80hrs a week a lot longer than you. It can be done, it's not always possible to cut down your hours. But do get out of pressure cookers like SF.
I did it for 10 years in Hong Kong, it will kill you. Move to a place with a lower level of stress. I'm in Phnom Penh now and even though my work is high stress, PP isn't. It helps. But you'll need to find work that will allow you to live in a nicer, cheaper, friendlier and less stressful place than where you are.
Stress over visas is also taking it's toll. I know from experience. Move to a place where immigration isn't constantly treating foreigners like dirt. They do exist. Sadly the United States is no longer one of those places.