Low Iron - Are my symptoms normal?

From the end of November last year, until the first week of January this year I was experiencing a weird feeling of dizziness, and generally feeling ‘out of it’. I went to my doctor, and they diagnosed an inner ear infection as they weren’t 100% sure, which required no treatment. My symptoms disappeared by the first week of January.

However at the end of March, my symptoms returned, and I had a blood test done. 4 days ago, I got my results - low iron, and generally slightly low vitamin levels. I was prescribed Ferrous Sulfate tablets for three months, alongside a general multivitamin. I’m anxious that my feeling ‘out of it’, disorientated, and dizzy are not symptoms of iron deficiency - as I thought iron deficiency just made you tired? Has anyone else had these symptoms? I’ve been taking the supplements and vitamins for 3.5 days now, how long do they take to help symptoms?