Soooo tired

I had a ton of energy during my second trimester, and now at 27 weeks 5 days, I'm like overly exhausted! I'm a server at a busy sports bar/restaurant, and am on my feet without any real breaks for 6-8 hours 4 days a week. Work has been overwhelmingly exhausting, but I need to keep working so I can stay home with my son for the first 2-3 months. On my days off I literally sleep around 16 hours a day(I get up to use the restroom and eat a few snacks). I also am just too tired to cook or do anything. My husband tries to help, but he doesn't really know how to cook anything besides frozen or microwaveable meals- which is better than nothing, but still not very healthy. On top of being so tired, I feel consistently full, so I don't know if I'm even eating nearly enough calories. I feel so confused by my body!!! Is anyone else going through extreme fatigue???? Does it go away after a bit or is this going to be like this the next 12 weeks 😓