Help I’m always so tired..

I’m seven weeks.. Finally gotten over my all day sickness. Now I’m struggling with staying awake. I work 10hours overnight and it’s taking a really bad toll on me. Is their any vitamins or something i can do? I just made me an omelette and I’m too tired to eat it. I get enough sleep between my shifts.. I’m just so freaking tired. 😩 At work I’m fine. As soon as i walk in my door my body gets so heavy and i can’t even wash my dishes without getting exhausted.