The short answer is YES. Iron deficiency anemia may lead to a rapid or irregular heartbeat. Your heart must pump more blood to compensate for the lack of oxygen carried in your blood when you're anemic. Tell your cardiologist-go to see him/her and have them investigate if you need something for the arrhythmia, on top of whatever they are giving you for the anemia.
Hello and welcome to the forum. Is it difficult to manage your anemia? I'd work with your doctor on this as anemia indeed can cause skipped heart beats and arrhythmias. Managing that sounds especially important for you. https://www.mayoclinic.org/diseases-conditions/anemia/symptoms-causes/syc-20351360 Your congenital heart defect of Fallot of tetralogy has been addressed through surgery? This can lead to anemia but normally it is prior to having it addressed by surgery. How do you address the anemia?