Aww mama, ang dizziness while breastfeeding ay common talaga, lalo na kapag pure BF kasi napakagutom ng katawan natin! A few of my mum friends also had the same issue, and yes, you can usually take both hematinic and B12 together, pero mas better kung i-confirm mo ito sa iyong OB or pediatrician first since they can check kung deficient ka talaga at ano ang best timing for you specifically. Make sure you're eating enough nutritious food din, hindi lang supplements, at drinking lots of water kasi dehydration is also a culprit ng dizziness. Take care of yourself, mommy, you can't pour from an empty cup!