Exhausted all the time!

So I am constantly exhausted to the point where I am not getting things I need are want to do done. I can’t clean my house I can barely bring myself to cook dinner and do basic tasks. I drag myself out of bed, go to work for 10 hours, take care of my grandpa and then come home to shower, eat whatever I can stomach and go to bed. I am worried and have no idea what to do. I’m limiting my caffeine to one cup of coffee. What are you ladies doing to make it through the day?? How do you maintain a healthy energy level??