So tired...rant

Is anyone else in their second trimester and STILL EXHAUSTED? I'm 23 weeks and can barely function. It is worse than my first trimester. I know it's not anemia, low blood sugar, or anything like that because my blood work has all come back normal. I feel guilty because I dont work, so there is no reason to be this tired. I try to fight through it and walk but it's like there are bricks tied to my feet and I'm moving in slow motion. I've honestly forgotten what it feels like to not be a zombie.