I am recovering from breast cancer, and have gone back to work. I know I am not walking as much as when I was out. I am feeling very tired again, similar to how I felt before being diagnosed with breast cancer. When I get home from work, I really feel too tired to do much of anything. I have been trying to do some yard work on the weekends, hoping that doing something would help build my energy and strength back up. I am wondering if I might have a vitamin deficiency, such as B vitamins. I have noticed when I am tired, I don t think clearly. What foods have a significant amount of B vitamins?