I am iron deficient concerned about the side effects of taking Ferro Grad C

I am very concerned about the side effects of taking Ferro Grad C (Containing Ferrous Sulfate + Sodium Ascorbate. I have a test result from my physician and they indicate a below normal level of Iron ‘ so he said I am iron deficient. I am taking one tablet every second day, on the third day I decided to not take it, I notice I felt light headed and as though I just came off an antidepressant, is this normal. I am eating meat three times a week; I have a gluten intolerance problem which I was diagnosed with, which may have been a contributing factor in becoming low in iron, and I lead a busy life. I would appreciate your advice and a second opinion to support my recovery process. Most of my life I haven’t taken any medication, except to treat inflammation in my bowl. Thank you.