Dizzy & fatigued

Having irregular bleeding and spotting. Driving me crazy. I'll be spotting for 4 days then bleeding for 3 then stops for a day and continues for another 3. Each period is so different to the last. I get Soo dizzy/lightheaded the day before and then a few days into my period. I have low iron levels, not taking iron supplements because the doctor says it's not good to take while trying to conceive (thinking of changing my doctor).