Iron Levels Low

Hi everyone. I could use some assistance. I suffer from anemia, (sometimes its severe), specifically when im on my period. I have gone to the doctor and he prescribed iron pills but after a day or two, they begin to make me sick. I have tried over the counter iron pills and it was the same outcome. I cant afford to keep going to the Dr and getting prescription iron pills. I am just inquiring about if there are any multivitamins that contain iron that have worked for anyone. TYIA.