Hi,
Are you continuing with iron medication now??
If your continuing with it,nausea
vomiting abdominal discomfort is common problem with iron tablets,
Regarding your headache and nausea vomiting,I think it most probably
migraine, it common in females,
anemia is also a strong possibility,some
blood test has to be done,if migraine is diagnosed,
For it you have to start with nsaids,
Then gradually shift on to other medicine if required,
I recommend you to visit a physician and get you symptoms evaluated and get medicine prescribed.
Hope this information helps.