14-15 hour shifts should be illegal and nobody should be in a position to have to work such hours. Even sane people will go crazy and nobody can be their best selves for this long. I'm glad you are not working longer than 8. That alone should show you great improvement. I have no advise because all the advise I could give would be things everyone already knows and I won't insult your intelligence like that. You can either do it, or you can't. I'm glad you have IP services available to you. Stay in contact with your doctors and let them know about all symptoms which get in your way of succeeding. Best wishes and luck going out to you.