I would have Dizziness, Headaches and an over all feeling of being un-well?

For a few months now there have been times when I would have Dizziness, Headaches and an over all feeling of being un-well that I would attribute to having acid reflux. However, just recently after experiencing my menstrual cycle, I thought that these feelings could be attributed to low iron due to my heavy flow, as there have also been times when I have had cold hands and feet very often. I took a iron supplement called 3 SSS Tonic, however I believe that the dose was too large, since then, I have been experiencing mild abdominal cramps, and what feels like a gasiness or bloating, since about 2 am to now. I have felt more energy overall from taking the iron supplement, but overall the stomach issues I am experiencing have left me with no appetite.