Suggest Treatment For Cramps And Dehydration After Taking Iron Supplements

I started an iron supplement to help with the anemic dizziness but my other symptoms are more along the lines of dehydration, but I wanted another opinion. My period is a few days late, which is the main question I suppose.. Can dehydration and/or the iron supplement cause a late cycle? Or should I be buying some tests. I still get dizzy, but not as badly or as often, I don t get sick, but if I eat too early in the morning I do tend to feel nauseous, which tends to go away once I start drinking. Other than that I have just the general symptoms I get a few days before my period, slight cramping and all that.