Miserable!!!! Help

I am 32+6 and soooooo miserable. I'm always lethargic. My energy level is at a 0 at all times, my appetite is non existent, my body aches constantly, i toss and turn all night and it seems no matter how much I rest I still get up feeling drained 😢 I recently found that my iron is low and I've started taking the supplements but they haven't made a difference so far. I'm starting to worry that it's something more. Can anyone relate? How can I fix this?