Does anyone suffer with extreme tiredness?

Nbr but the doctors aren't really helping. I literally cannot stay awake, I'm so grateful my toddler is trusted and my house is baby proofed. I could be sat on the sofa and next thing I know an hours gone by. I've had every blood test every 3mo for a year and the only thing what's came up was low b12 and low vitamin d but as of last week they're all back to normal but I'm as tired as ever. Has anyone found anything what helps?? I'm taking multi vitamins, extra b12 and vit d. I am under investigation for autoimmune issues so it's still a guessing game but it's destroying my life. I find it so hard to go out and when I do I feel like I'm about to pass out from exhaustion when I come home😭