As you think, so you become. If you always think of taking breaks, you will break. Just enjoy the work. Real joy comes when you work for others and not for yourself. When you work for yourself, you develop anxiety, you develop worry and fear. When you work for others there is joy.
That is Karma Yoga, selfless service. If you really want to enjoy your work, this is the only way. Work for others or work for God, if the name of God and the creation. Just put yourself out of the picture. “I am not doing anything for myself I don’t have to; I don’t want to. I am here to serve others.” You take care of them. If the others need your service, it’s their business to take care of you. You don’t have to worry about taking care of yourself.
Remember: If you decide to take care of yourself, you are the only person to take care of you. If you let others take care of you, so many will do that.
That’s the secret. Don’t worry about taking care of yourself. Just think of others; then you will be taken of.