doctors today told me I'm 34 weeks but measuring 35 baby is head down already which is good and they…

doctors today told me I'm 34 weeks but measuring 35 baby is head down already which is good and they checked my iron today which they said is bad.. normally its suppose to be around 37 mine was around 25... so I have to take a iron supplement which last time I did that I got really dizzy even if I took it with food. anyone have any tips on how to help me take it without passing out or getting sick??