Extreme fatigue

Can someone shine some light or just point me in the right direction of what to do cos i dunno how much longer i can go on every single day im exhausted from the second i wake up until i go to bed, ive been doctors had blood tests my anemia wasnt even that bad but they still prescibed me iron tablets to help with energy levels this was 2 months ago i feel no different whatsoever, i thought it was cos of the implant so i had it out months ago, my diet is really healthy i cut out all the junk & sugary foods im literally at the end of my tether here i have a 22 month old who i feel guilty on her because i feel like i cant keep up with her cos of how im feeling everyday, i have to wake up 3 hours before she wakes up everyday just to get out of bed ready for her to wake literally 3 hours every single day, i goes to sleep soon as shes asleep an shes a really good sleeper always have been she sleeps 12-14 hours a night, ive been on antidepressants for years and theyve helped me so much so i dont think its to do with that either i just dunno why i feel so low constant its making me doubt myself as a parent cos i feel like i cant do sooo many activities all day everyday with her i take her out everyday anyways but as i said its like i cant keep up with her, someone please help tired tired mummy here