Iron prescription

I wasn't sure where to post this but - after I had my daughter, while in the hospital they told me my pregnancy had made me anemic. When I had my second less than a year later I was told I was still anemic although I had been taking the iron I was prescribed for a few months at that point. At my 6 week pp checkup my dr told me my iron levels were finally perfect and I can stop taking the prescription because I'm fine now. Ever since, I've had horrible headaches and dizziness like I had while I was anemic. Has this happened to anyone else? Could it just be my body getting used to being off of the iron? (Dr is currently closed, just looking for any other opinions :))