I have been on ferrous sulfate 325mg 3forx a day for the past month and have honestly been feeling 80% better. however, all week I've been feeling worse. I get short of breath everytime I take the pills, I'm dizzy when i wake up until I go to bed, and I have had headaches . I also feel nauseousat least 8 hours on and off out of the day. ever since I started taking the pills twice a day I'm feeling worse. what is going on????